Swimming Pool Water Treatment Practical Application of YudaCentury Chitosan

Swimming Pool Water Treatment Practical Application of YudaCentury Chitosan

Medium and large swimming pools feature large water volumes, high visitor flow and complex operating environments, which bring three prominent water quality challenges: turbid water, accumulated organic matter and overloaded filtration systems. This is especially true for outdoor pools, club pools, school pools and commercial constant-temperature pools. Under high temperatures, peak visitor hours, rainfall or heavy leaf and dust accumulation, the pool water easily turns milky white with low transparency, slippery pool walls and strong unpleasant odors.

As a natural polymer flocculant, chitosan removes fine suspended solids, organic residues, grease, algae spores and partial metal ions in water through electrostatic adsorption and bridging effects. It aggregates tiny contaminants into large flocs that can be trapped and eliminated by sand filters, cartridge filters and diatomaceous earth filters. When combined with standard disinfection and pH adjustment, it reduces water turbidity, improves water clarity and cuts excessive disinfectant consumption.

I. Core Functions of Chitosan in Medium & Large Swimming Pools

1. Improve Water Clarity

Suspended solids in pool water include dust, sediment, dander, sweat, cosmetic residues, insect debris and algae spores. Most of these particles are micro-fine and hard to eliminate merely by circulating filtration. Chitosan binds these tiny particles together into large flocs that filters can easily capture, rapidly restoring crystal-clear water.

2. Reduce Organic Load

Sweat, body oil, skincare products, hair and skin flakes carried by swimmers continuously contaminate pool water. These organics consume disinfectants, weaken disinfection performance, generate chloramine odors, leave slippery wall films and accelerate water aging. Chitosan adsorbs a portion of organic pollutants and reduces the formation basis of disinfection byproducts.

3. Auxiliary Algae Control

Slightly green water and slippery pool walls indicate active algae spores. While chitosan cannot replace algaecides independently, it adsorbs algae spores and suspended contaminants to help filters remove algae-related pollutants more effectively.

4. Ease Filtration System Burden

Medium and large pools with heavy foot traffic and dusty surroundings often suffer frequent filter blockages, manifested as elevated filter pressure, reduced circulation efficiency and frequent backwashing. Chitosan accelerates floc formation from impurities to boost filtration efficiency and lower system operating load.

5. Optimize Swimming Experience

After chitosan application, pool water becomes clearer with less surface oil film and suspended solids, and slippery wall residues are minimized. Paired with stable disinfection and pH control, it delivers a noticeably cleaner and more comfortable swimming environment.

II. Recommended Dosage of Chitosan for Medium & Large Swimming Pools

Chitosan dosage varies based on pool volume, water turbidity, visitor volume, weather conditions and filter efficiency. The below reference dosages apply to medium and large pools. Always start with a low dose and observe water quality for 24 hours before supplementary dosing.

1. Daily Maintenance Dosage

Applicable to pools with clear water and stable daily operation.

Standard Dosage: 20–30 grams of chitosan powder per 100 cubic meters of water

Pool Volume Single Recommended Dosage

Application Frequency: Once weekly, or right after each filter backwashing cycle.

2. Emergency Dosage for Turbid Water

Applicable to milky/turbid water, post-rain water degradation, sudden surges in visitors, and outdoor pools with heavy fallen leaves and dust.

Standard Dosage: 50–60 grams of chitosan powder per 100 cubic meters of water

Pool Volume Single Recommended Dosage

Application Guide: Keep the filtration system running continuously for at least 24 hours and monitor water clarity. If slight turbidity remains after 24 hours, add a low supplementary dose; avoid excessive one-time dosing.

3. Dosage for High-Temperature Seasons & Outdoor Pools

Water quality deteriorates faster in hot summer, rainy weather and pools surrounded by dense vegetation, requiring more frequent treatment.

Standard Dosage: 40–60 grams of chitosan powder per 100 cubic meters of water

Application Frequency: Once every 3–4 days, adjusted based on actual turbidity.

4. Dosage for Newly Filled or Refilled Pools

Fresh refill water is inherently clean, yet impurities from pipelines, sand filters and the surrounding environment may still enter the pool. Avoid heavy initial dosing.

Standard Dosage: 20–30 grams of chitosan powder per 100 cubic meters of water

Application Timing: Start the circulation system and stabilize pH and residual chlorine levels before adding chitosan.

III. Pre-Application Preparation

1. Remove Floating Debris

Skim floating leaves, insects, plastic waste and obvious sediment from the pool surface and floor before dosing chitosan.

2. Inspect Filtration Equipment

Check normal operation of sand filters, cartridge filters and diatomaceous earth filters. Perform backwashing or deep cleaning if filters are severely clogged, otherwise flocs formed by chitosan cannot be fully discharged.

3. Test pH Value

Maintain pool water pH between 7.2 and 7.8. Overly high or low pH impairs flocculation efficiency and disinfection performance.

4. Verify Residual Chlorine Level

Chitosan is not a disinfectant and cannot replace chlorine, chlorine dioxide, bromine or other sanitizers. Confirm the disinfection system works properly before application.

5. Calculate Exact Pool Volume

Volume Formula: Length × Width × Average Water Depth

Example:

Pool dimensions: 25m long, 10m wide, 1.5m average depth

Total Volume = 25 × 10 × 1.5 = 375 m³

Daily maintenance dosage calculation:

375 m³ × 0.2–0.3 g/m³ = 75–112.5 grams of chitosan

IV. Standard Operating Steps for Medium & Large Pools

Step 1: Backwash the Filter

Complete filter backwashing to discharge trapped contaminants, reduce filter pressure and maximize subsequent flocculation performance.

Step 2: Activate Circulation System

Turn on the circulation pump to maintain constant water flow. Chitosan requires full water circulation to fully interact with suspended contaminants.

Step 3: Dissolve Chitosan Powder

Never broadcast undiluted chitosan powder directly into the pool; this causes local caking, uneven settlement and sediment accumulation on the pool floor.

Recommended Dissolution Process:

1. Prepare a clean plastic bucket

2. Add warm water

3. Weigh out the required chitosan powder

4. Slowly pour powder into the bucket while stirring continuously

5. Keep stirring for 3–5 minutes

6. Let the solution stand briefly and confirm full dissolution with no lumps

7. Proceed to dosing only after complete dissolution

Step 4: Uniform Application

Pour diluted chitosan solution evenly along the pool perimeter. Do not pour concentrated solution at a single spot, especially near return inlets or skimmers.

Suggested dosing zones:

- Evenly distribute solution along all pool edges

- Focus dosing on areas with visible turbidity

- Avoid static water dead zones

- Keep circulation running after dosing

Step 5: Continuous Circulation & Filtration

Maintain uninterrupted circulation for a minimum of 8 hours post-dosing. For severely turbid water, run the system 24 hours straight.

Step 6: Monitor Filter Pressure

Filter pressure will gradually rise as flocs are captured, indicating effective impurity interception. Conduct backwashing or filter cleaning promptly once pressure spikes significantly.

Step 7: Judge Supplementary Dosing

Add a low supplementary dose if mild turbidity persists after 24 hours. Resume the regular weekly maintenance schedule once water becomes fully transparent.

V. Compatibility of Chitosan with Other Pool Chemicals

Chitosan can be used alongside conventional pool treatment chemicals, but do not mix different agents for simultaneous dissolution.

1. Compatibility with Disinfectants

Chitosan cannot replace disinfection systems. Chlorine, chlorine dioxide, bromine and other sanitizers must be dosed per standard requirements. Chitosan removes suspended solids and organics, while disinfectants eliminate bacteria, viruses and algae.

2. Compatibility with Algaecides

Treat severe green algae, black algae and slippery wall film with algaecides first. Chitosan assists in adsorbing algae spores and dead algae residues but cannot resolve heavy algae contamination alone.

3. Compatibility with pH Adjusters

pH directly impacts flocculation efficiency. Adjust pH to the 7.2–7.8 range before chitosan application.

4. Incompatibility with Strong Acids

Never mix chitosan solution with strong acid chemicals. Dissolve and dose them separately, with sufficient water circulation between applications.

VI. Critical Precautions

1. Avoid Over-Dosing

Higher chitosan dosage does not equal better results. Excess dosage leads to sediment buildup, spiked filter pressure and milky cloudy water.

2. Do Not Broadcast Dry Powder Directly

Undiluted powder floats, clumps and settles unevenly at the pool bottom, drastically reducing treatment effectiveness.

3. Cannot Replace Disinfection

Chitosan acts as an auxiliary water clarifier only; it cannot substitute standardized disinfection protocols.

4. Timely Filter Maintenance for High Pressure

Sharp pressure increases signal heavy impurity interception; perform immediate backwashing or cartridge cleaning.

5. Low Initial Dose for Refilled Pools

Fresh water has minimal contaminants; start with the minimum recommended dosage to avoid waste and water quality fluctuations.

6. Dry Storage Requirements

Seal chitosan powder tightly and store in cool, dry and ventilated areas to prevent moisture-induced caking.

VII. Comprehensive Water Management Plan for Medium & Large Swimming Pools

Treatment Item Core Function

Circulation & Filtration Remove suspended solids and maintain water flow

Disinfection Control bacteria, viruses and microorganisms

pH Regulation Stabilize water quality and boost disinfection efficiency

Algae Prevention & Treatment Prevent and eliminate algae growth

Chitosan Auxiliary flocculation, organic adsorption, clarity improvement

Chitosan serves as a vital supplement for routine water maintenance rather than an all-in-one solution. Stable long-term pool water quality relies on standardized daily management, regular equipment maintenance and coordinated chemical treatment.

Conclusion

The core advantage of chitosan in medium and large swimming pools lies in its natural flocculation performance, which rapidly clarifies pool water, cuts organic pollution load, eases filtration system strain and enhances overall swimming comfort. Adjust dosage flexibly based on pool volume, turbidity, visitor flow and local weather, and follow the standard workflow: clean impurities first → dose dissolved chitosan → run full circulation → monitor water quality regularly.

For commercial swimming pools, club pools, school pools and outdoor aquatic facilities, proper application of Yuda Century chitosan streamlines water quality management and sustains consistently clear, clean pool water long-term.

Yudacentury As a supplier of chitosan application solutions with 24years experience.

Our main products: chitin, chitosan, Hydroxypropyl Chitosan, Hydrochloride Chitosan, Chitosan Lactate, Carboxymethyl Chitosan.

With origin: Chitosan Fresh North Atlantic Shrimp Shell/Crab Shell Origin

Chitosan Aspergillus Niger Origin

Chitosan Agaricus bisporus Origin mushroom

More details and solutions ,please contact us.