Problems and Solutions You Can Solve for Your Pool
“Each problem, once solved, helps prevent or solve other problems in the future.”
Pools have common problems and standard solutions.
Shock Chlorination (Shock Treatment)
This is not just adding chlorine, but temporarily raising its level for deep water disinfection.
Breaking Point: This is when enough chlorine has been added to not just handle contaminants but completely destroy them.
Before this point, chlorine is “busy” reacting with organics and chloramines. Afterward, it works as a full disinfectant.
If the dosage is insufficient, the problem isn’t solved and may temporarily worsen (odor, irritation).
Purpose: Shock chlorination:
- Breaks down chloramines (source of odor and irritation)
- Oxidizes ammonia and organic contaminants
- Restores disinfectant efficiency
Safety: Swimming is prohibited until free chlorine returns to a safe range (approximately 1–3 ppm). This usually takes 12–24 hours, but in complex cases or with fully replaced water, it may take up to a week depending on dosage and water condition.
Coagulants and Flocculants — Fighting Cloudiness
When the filter cannot handle it, water becomes cloudy due to very fine particles (dust, organics) too small to be trapped by the filter.
“Snowball Effect”: These chemicals help tiny particles clump into larger ones. As a result, they either settle on the bottom or get caught in the filter.
Flocculants: Work slowly but effectively, binding particles into large clumps that settle — these must be removed with a vacuum in drain mode.
Coagulants: Work during filtration, increasing particle size in the water flow so the filter can trap them.
Biofilm — “Armor” for Microbes
Biofilm is a colony of microorganisms covered with a protective mucus layer.
Where it hides: On pool walls, in pipes, inside filters, and in hard-to-reach places (e.g., behind lights or in tile joints).
Danger: The mucus layer protects microbes inside. Chlorine may be present at normal levels but cannot penetrate effectively to kill bacteria.
Problem: Even if water looks clean, the system may still harbor a source of contamination.
Black Algae: Dense growths that embed deeply into surface pores and joints. Regular treatment isn’t enough — mechanical cleaning (brushing) and enhanced chlorine treatment are required.
“Cocktail” in Water and Salt Accumulation
Over time, the pool water accumulates everything that enters it — minerals, chemical residues, and contaminants.
Evaporation: As water evaporates, dissolved substances (salts, minerals) remain.
Refilling: Adding fresh water introduces more minerals, gradually increasing concentration.
Accumulation: Over time, salt and stabilizer (CYA) levels rise. Water “ages,” its properties change, it becomes harder to control, may cause discomfort, and accelerates equipment wear.
Practical Implication: Water may look normal but becomes increasingly difficult to manage.
Solution: The only way to reduce accumulated substances is partial water replacement. Refilling increases concentration; replacing lowers it. Backwashing the filter removes some debris and replaces a small amount of water but does not fully solve the problem.
Formula for Success: Analysis + Calculation = Accurate Dosage
This is the key principle of pool maintenance — you cannot act “by eye.”
Overdose Risk: Excess chemicals accelerate equipment wear and make water harsh for skin and eyes.
Underdose Risk: Insufficient treatment allows algae growth and reduces sanitary safety.
Modern Approach: Accurate measurements (photometers and devices for monitoring ORP, TDS, and other parameters) provide real water data. Based on this, chemical dosages are calculated according to pool volume.
Conclusion
Every pool problem has its cause and solution — there are no universal methods.
It’s like medicine: you cannot take the same drug for all symptoms — first understand the cause, then act.