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Pool Maintenance in Europe: Three Challenges the Industry Needs to Address
Maintaining a swimming pool is about more than keeping the water clear. It requires an understanding of water chemistry, reliable measurements, practical experience and the ability to make informed decisions when conditions change.
Through our work with swimming pools and hot tubs, we have repeatedly encountered three challenges: unnecessary chemical use, limited access to practical expertise, and digital tools that address individual tasks without connecting them into a complete picture.
These challenges are closely related. When water chemistry is poorly understood, treatment becomes reactive. When practical knowledge is difficult to access, specialists have fewer resources to support their decisions. And when information is scattered across different tools, it becomes harder to understand how a pool's condition changes over time.
At PoolHealth, we believe better pool maintenance starts with understanding the water.
1. More Chemicals Don't Necessarily Mean Better Water
When water becomes cloudy, algae appear or scale starts forming, adding another chemical may seem like the quickest solution.
But a visible problem is not always the underlying problem. Treating symptoms without understanding their cause can lead to unnecessary chemical use, additional costs and further imbalances.
Chlorine effectiveness depends on the wider chemical balance
Cyanuric acid (CYA) protects chlorine from degradation by sunlight, making it useful in outdoor pools. However, increasing CYA levels affect chlorine's disinfection performance at a given free chlorine concentration.
Stabilised chlorine products add CYA to the water, and it can accumulate over time. If its concentration becomes too high, simply adding more chlorine may not be the most appropriate response.
In pools without CYA, on the other hand, the quality of disinfection depends strongly on pH. Automation can help solve these problems, but it can also make them more complicated. It all depends on the type of chemicals used and on how the system is set up.
The solution starts with accurate measurements and an understanding of how the disinfection system works. Appropriate operating levels depend on the pool, the treatment method and the applicable requirements.
Water balance affects surfaces and equipment
Water chemistry influences more than disinfection. It also affects pool surfaces, pipes and equipment.
The Langelier Saturation Index (LSI) is commonly used to assess water's tendency towards calcium carbonate precipitation or dissolution. Its calculation considers factors including pH, temperature, total alkalinity (TA), calcium hardness (CH) and dissolved solids (TDS).
An LSI close to zero is often used as a reference for balanced water. A range around -0.3 to +0.3 is commonly used as a practical target, although the appropriate range depends on the system and the guidance being followed.
Water with a tendency to form scale can contribute to deposits and restricted flow. Water with a tendency to dissolve calcium carbonate may affect susceptible surfaces, while corrosion also depends on the materials and other chemical conditions involved.
On its own, however, the LSI tells you very little. It has to be read in context: which chemicals are used and what by-products they add to the water, what was done to the pool before, whether there are already visible problems, the rest of the water chemistry, and what equipment is installed.
This is why adjusting pH alone is not always enough. The relationship between the relevant parameters matters.
Why we avoid algaecides
At PoolHealth, we do not use algaecides in our pool maintenance practice. Our approach focuses on understanding water chemistry, maintaining effective disinfection and addressing the underlying conditions that allow algae to develop.
Some algaecides contain copper or other active ingredients that can leave residues in the water. Copper may accumulate over time and contribute to staining under certain conditions. Correcting these problems can require additional treatment, increasing chemical use, costs and maintenance complexity.
Rather than routinely adding another product, we focus on identifying the cause of the problem and correcting the relevant conditions, including water balance, disinfection and circulation.
Our position reflects the approach we use in our own work. It is not a claim that every algaecide has identical properties, but a deliberate choice about how we manage pools.
Our principle is simple: understand the problem first, then choose the appropriate solution. More chemicals are not automatically the answer.
This does not mean that using the smallest possible amount of chemicals is always the right approach. Insufficient disinfection can compromise water safety. The objective is to use the right treatment, in the right amount, for the right reason — based on reliable measurements rather than guesswork.
2. Professional Expertise Matters More Than Following a Routine
Pool maintenance combines chemical knowledge, practical experience and an understanding of equipment and operating conditions.
Training and continuing professional development can be expensive, and in our experience some specialists have limited opportunities to develop their knowledge systematically and end up learning through trial and error. Yet the absence of professional certification can cost much more: a mistake in water chemistry can put bathers at risk, damage equipment and surfaces, and cost a specialist the trust of clients.
This is an observation from our own work, not a statistical claim about the entire European market. Nevertheless, it highlights an important challenge: professionals need better ways to apply their knowledge consistently and support their decisions.
Every pool presents a different situation
There is no universal chemical dosage that works for every pool.
The appropriate treatment depends on factors such as water volume, current readings, temperature, usage, the disinfection method, equipment and the chemicals already present.
For example, the amount of acid required to adjust pH depends partly on total alkalinity (TA), CYA and the pool environment, and also on the type of acid, its concentration and its strength. Chlorine management depends on the disinfection system, the chemicals used, filtration efficiency, bather load and, where applicable, cyanuric acid (CYA). A recommendation that ignores these factors can be incomplete or misleading.
Conditions can also change unexpectedly. A pool may develop a problem between visits, equipment may behave differently than expected, or a specialist may encounter a situation that does not fit a familiar pattern.
This is where professional expertise becomes essential.
A good specialist does not simply follow a fixed sequence of tasks. They interpret the available information, recognise when something is unusual and adapt their approach to the actual condition of the pool.
Digital tools can support this process by making calculations, historical readings and relevant information easier to access. They cannot replace practical experience, reliable testing or professional judgement.
Different countries, different requirements
Pool professionals working across Europe must also understand the requirements applicable to each facility and country.
Public swimming pools, private pools and hot tubs may be subject to different regulations and recommendations. Values should not be assumed to apply universally.
A platform designed for international use must account for these differences and help users work with the conditions relevant to their particular pool.
At the same time, we aim to build one safe system that works regardless of the country. For this reason, PoolHealth’s own standards can be considerably narrower than the requirements of an individual country. Local rules still apply and remain the responsibility of the person in charge of the pool.
3. Digital Tools Should Support Professional Judgement
The pool industry already has software for customer management, visit records, chemical calculations, reporting and business operations.
These tools can be useful. The challenge is that important information can remain separated.
A maintenance record tells you what was done. A chemical calculator helps you evaluate a particular set of readings. Business software can organise customers, schedules and finances.
But recording an action is not the same as understanding its consequences.
Pool maintenance cannot be reduced to a fixed plan
Unexpected water conditions, equipment problems and changing priorities mean that specialists must adapt their decisions to the situation in front of them.
Planning routes and scheduling visits can support daily organisation, but these activities do not define the quality of a specialist's work. A carefully planned day does not guarantee that the water will be balanced, the equipment will function correctly or an unexpected problem will be resolved.
For us, the priority is not to make professional work follow a more rigid plan. It is to give specialists better information so they can make informed decisions when circumstances require them to adapt.
Reliable measurements come first
The quality of any calculation depends on the quality of its input data.
Test strips provide approximate readings and do not cover every parameter needed for a detailed chemical assessment. In an independent comparison of free chlorine testing methods, test strips were the least accurate of the kits tested and colorimeters the most accurate (Murray and Lantagne, 2015). They can be useful for basic checks, but they should not be treated as a substitute for suitable measurement equipment when accurate calculations are required.
PoolHealth is designed around recorded measurements from appropriate testing equipment, including photometers. The aim is to help users interpret their readings, understand the relationships between parameters and evaluate possible treatment adjustments.
Technology is most useful when it helps professionals understand what is happening in the water, rather than simply recording what they have done.
Our Approach: Understand the Water Before Deciding What to Do
We developed PoolHealth because we wanted a more connected way to approach water analysis and everyday pool maintenance.
The platform brings together water chemistry calculations, historical readings, treatment support and maintenance workflows. It is designed for pool owners, independent specialists and pool-service businesses.
Rather than treating every reading as an isolated number, PoolHealth helps users build a clearer picture of the pool's condition and how it changes over time.
1. Analyse the water
Record the relevant measurements, including pH, free chlorine, total alkalinity (TA), calcium hardness (CH), cyanuric acid (CYA) where applicable, total dissolved solids (TDS) and water temperature.
Additional parameters can be considered when the situation requires them.
PoolHealth calculates water-balance indicators and supports the assessment of chlorine levels in relation to cyanuric acid (CYA) or pH, depending on the type of disinfection. By keeping a history of readings, users can examine trends and compare the current condition with previous results.
2. Establish the appropriate target
Treatment targets should reflect the pool's operating conditions, equipment and applicable requirements.
For example, free chlorine should not be considered in isolation from cyanuric acid (CYA) or the disinfection method. Understanding the wider context helps users assess whether a target is appropriate for their particular pool.
3. Evaluate possible adjustments
PoolHealth provides calculation tools and recommendations to help users evaluate potential treatment changes.
Users can examine a suggested dose or enter their own proposed amount and assess how it may affect other water parameters. This makes it easier to consider the broader consequences of a treatment decision before acting.
The final decision remains with the person responsible for the pool. PoolHealth supports professional judgement; it does not replace appropriate testing, product instructions, applicable regulations or safe working practices.
Our calculations and workflows have been refined through years of practical experience and continue to evolve as we develop the platform.
Why This Matters Across Europe
Pool professionals work in different regulatory environments, with different pool types, disinfection systems and operating conditions.
There is no single set of operating values that can be applied indiscriminately to every pool in Europe. National requirements and technical guidance must be considered in the context of the particular facility.
International guidance, including the World Health Organization's recommendations for swimming pools, provides a broader framework for understanding risks such as microbial contamination and exposure to chemicals. Local requirements and the specific conditions of each pool remain important. Combined chlorine (CC) standards, for example, vary from about 0.2 to 0.5 ppm.
For a digital platform serving multiple European markets, flexibility is essential. Calculations and workflows must support different systems and conditions rather than rely on a single fixed approach.
PoolHealth supports swimming pools and hot tubs, including systems that use cyanuric acid (CYA), salt chlorination and automated dosing. The platform is available in English, German, French, Spanish, Greek and Russian.
Our aim is to make water analysis and maintenance information more accessible across different markets while keeping the focus on reliable measurements and informed decisions.
Better Pool Maintenance Starts With Better Understanding
Clear water is only one part of a well-maintained pool.
Long-term quality depends on understanding water chemistry, recognising changes, choosing appropriate treatments and adapting decisions to the actual situation.
More chemicals do not automatically produce better results. More rigid processes do not necessarily produce better maintenance. And digital tools are most useful when they help professionals understand the problem rather than simply record the task.
At PoolHealth, we believe technology should support the knowledge and judgement of the people responsible for pool care.
Our goal is to help pool owners and specialists make better-informed decisions, understand changes in water quality and manage treatment more systematically — without compromising water quality or safety.
PoolHealth — Beyond Water Clarity.
Frequently asked questions
Can too much chlorine or other chemistry be a problem in a pool?
Yes. Stabilised chlorine adds cyanuric acid (CYA), which reduces the disinfecting power of free chlorine, and Germany's Federal Environment Agency (UBA) notes that pools often reach excessive cyanuric acid (CYA) without their owners knowing. Heavy dosing can also push the water out of balance and be dangerous for humans. The aim is the right amount for that pool on that day, not the least possible and not the most.
What is combined chlorine (CC)?
Combined chlorine (CC) is chlorine that has already reacted with nitrogen-containing compounds in the water, such as urea. It disinfects far less than free chlorine. Standards for combined chlorine (CC) vary from about 0.2 to 0.5 ppm. A reading that climbs over time is a signal to act, which is why a log with trends is more useful than a single test.
Does more cyanuric acid (CYA) protect the water better?
Not beyond a point. Cyanuric acid (CYA) shields chlorine from sunlight, but higher levels reduce the disinfecting power of free chlorine, so more chlorine is needed to do the same work. Because it is not used up like chlorine, it builds up when stabilised chlorine products are used repeatedly. The UBA says stabiliser must be dosed precisely and that an overdose can show as milky water; its remedy is dilution with fresh water. Numeric limits differ by country: French health authorities call more than 75 mg/L too high (ideal about 30 mg/L), and Spain’s Royal Decree 742/2013 sets a maximum of 75 mg/L and requires closing the pool above 150 mg/L. PoolHealth recommends 50 ppm (mg/L) as the upper limit.
Do I need an algaecide?
No. Many pool owners use one as extra protection, but copper-based algaecides add copper to the water, which can build up and stain surfaces, and removing it takes sequestrants or an acid wash. In our practice we do not use algaecides. We rely on balanced water and correct disinfection, which we track in PoolHealth.
What does the Langelier Saturation Index (LSI) tell me?
LSI combines temperature, pH, alkalinity (TA), calcium hardness (CH), dissolved solids (TDS) and cyanuric acid (CYA) into one number that shows whether water tends to corrode or form scale. A value around zero, commonly between -0.3 and +0.3, is considered balanced. Negative values point to corrosion of surfaces and equipment, positive values to scale and clogged pipes. On its own, however, the LSI tells you very little. It has to be read together with the chemicals used and the by-products they add, the pool's history, any visible problems, the rest of the water chemistry and the equipment installed.
Is PoolHealth a replacement for a pool specialist?
No. PoolHealth is a tool, and what you get from a tool depends on who uses it and how. It shows what is happening in the water and what to do about it, and the decision stays with you. For repairs and equipment problems you can find a specialist inside the app.
Sources
- World Health Organization (2006). Guidelines for safe recreational water environments, Volume 2: Swimming pools and similar environments
- Umweltbundesamt (UBA, Germany). Swimmingpool: questions and answers (cyanuric acid, disinfection, algaecides)
- Umweltbundesamt (UBA, Germany). Pool hygiene and disposal of pool water
- Umweltbundesamt (UBA, Germany). Hygieneanforderungen an Bäder und deren Überwachung (Bundesgesundheitsblatt, 2026): guide values for free and combined chlorine, DIN 19643
- Eawag (Swiss Federal Institute of Aquatic Science and Technology). Trichloramine or pathogens in pool water?
- ARS Occitanie (France). Qualité des eaux de piscine: questions / réponses (stabilisant, chlore libre)
- Boletin Oficial del Estado (Spain). Real Decreto 742/2013, criterios tecnico-sanitarios de las piscinas, Anexo I (acido isocianurico, cloro libre residual)
- Murray A., Lantagne D. (2015). Accuracy, precision, usability, and cost of free chlorine residual testing methods. Journal of Water and Health 13(1), 79-90
- Pool Research. Basics of Pool Water Saturation Index
This guide is general information, not medical or professional advice. Always follow product labels and the rules that apply where you live. Statements marked “in our experience” come from our own practice.
Spotted something outdated or inaccurate? Tell us at info@pool-health.com and we will check and correct it. Last reviewed: October 2026.