Natural flocculant to make your pool water crystal clear
Cloudy pool water: a problem with a natural and quick solution
There are few things more frustrating in summer than looking at your pool and seeing greenish, milky water, or that cloudy appearance that makes it impossible to see the bottom. Turbidity can appear overnight for multiple reasons, and when it does, most people resort to chemical flocculants which, in reality, can cause more problems than they solve. Fortunately, there is a completely natural, fast-acting, and safe alternative for the whole family.
At Puerto Verde, we formulate a 100% natural powdered flocculant, free of aluminum sulfate and any synthetic chemical compounds. Therefore, in this article, we explain exactly why water gets cloudy, what risks conventional chemical flocculants pose, and how to use our natural flocculant step-by-step to recover that crystal-clear blue you're looking for.
Why does pool water get cloudy?
To choose the right solution, it's first important to understand the origin of the problem. Water becomes cloudy when very fine suspended particles accumulate that the sand filter cannot retain on its own, as they are too small to be trapped in the filter bed.
The most common causes of turbidity
- Algae in early stages: before green is visible, microscopic algae in suspension give the water a cloudy or greenish appearance that is difficult to identify.
- Dust, pollen, and environmental particles: especially in windy areas or near trees, water receives millions of fine particles every day that exceed the usual filtration capacity.
- pH imbalance: when the pH rises above 7.6, chlorine loses effectiveness and organic waste does not decompose properly, leading to progressive turbidity.
- Intensive summer use: sunscreens, sweat, and tanning lotions from bathers generate organic compounds in suspension that quickly accumulate turbidity.
- Heavy rain: rainwater carries soil and organic matter from the surroundings, dilutes treatment products, and suddenly unbalances the pH.
- Insufficient filtration: if the pump runs fewer hours than necessary or the filter has exhausted sand, fine particles inevitably accumulate in the water.
Standard sand filters retain particles between 20 and 40 microns. However, many of the particles that cause turbidity are between 1 and 10 microns, so they pass directly through the filter bed without being captured.
This is where the flocculant acts: it groups these ultrafine particles into larger clumps (flocs) that the filter can retain, or that settle at the bottom to be vacuumed. In this way, clarification is achieved that no conventional filter could accomplish on its own.
The problem with chemical flocculants containing aluminum sulfate
The vast majority of conventional flocculants on the market use aluminum sulfate (Al₂(SO₄)₃) as their active ingredient. While effective in agglomerating particles, its continued use in pools carries significant risks that should be understood before using it.
Risks of aluminum sulfate in bathing water
Skin and mucous membrane irritation: aluminum in solution generates aluminum hydroxide, a compound that can irritate the skin, eyes, and mucous membranes, especially in people with sensitive or atopic skin and in young children whose skin barrier is not yet fully developed.
pH decrease: aluminum sulfate is acidic and, when added to water, significantly lowers the pH. This decrease requires constant addition of correctors, creating a cycle of adjustments that complicates maintenance and increases the total cost.
Accumulation of aluminum in water: with each application, some aluminum remains dissolved in the water. Since this metal is absorbed cutaneously and has been associated in scientific studies with negative effects on the nervous system with prolonged exposure, its continuous presence is not desirable in any family pool.
Environmental impact: wastewater from pools treated with aluminum sulfate contributes metal loads to the soil and groundwater, with negative effects on the flora and fauna of the environment.
Who should especially avoid flocculants with aluminum
- People with sensitive or atopic skin, who may experience itching, redness, or irritation after bathing.
- Babies and young children, whose skin barrier is more permeable and whose exposure in proportion to body weight is greater.
- Those with previously diagnosed allergies or contact dermatitis.
- Any family that wants to reduce exposure to metals and synthetic compounds in bathing water.
Why Puerto Verde's natural flocculant is different
Puerto Verde's natural flocculant acts on the same physical principle as chemical flocculants, but without resorting to metallic salts or synthetic compounds. Instead, it uses natural components that agglomerate suspended particles, forming flocs that the filter can retain or that settle at the bottom to be vacuumed. The result is identical in efficacy, but completely different in safety.
- No aluminum sulfate or any other metallic compound
- Suitable for sensitive, atopic skin, and for children
- Does not alter the pH of the water: fewer corrections, fewer products, less expense
- Fast acting: visible results in 8-12 hours
- Powder format with exact dosing by scoops, without complicated measurements
- Compatible with all disinfection systems: chlorine, salt, bromine, and UV
- 100% biodegradable: does not contaminate soil or groundwater
💧 Crystal clear water in 8-12 hours
No aluminum sulfate · No irritants · Does not alter pH · Powder formatHow to use the natural powdered flocculant: dosage and application
One of the great advantages of our flocculant is its powder format with scoop dosing, which eliminates measurement doubts and makes the process very simple. Below we explain the exact dose according to the type and size of your pool, and the step-by-step application method.
Dosage according to your pool size
The reference dose is 2 scoops for every 10 m³ of water, for both standard pools and spas and whirlpools. Adjust the amount according to the degree of turbidity: if the water is very cloudy, you can slightly increase the dose.
scoops per treatment
scoops per treatment
scoops per treatment
scoops per treatment
If you don't know the exact volume of your pool, the formula is simple: multiply length × width × average depth in meters. For example, a pool 8 m × 4 m × 1.5 m average depth has 48 m³, so it would need approximately 10 scoops per treatment.
Remember that we also have different product formats to adapt to any pool size or frequency of use.
Step-by-step application
- Check that the water pH is between 7.0 and 7.4 before applying the flocculant. If it is outside this range, correct it first to ensure maximum product effectiveness.
- Perform a backwash of the filter so that it starts clean and in optimal conditions to retain the flocs that will be generated.
- With the recirculation system running, slowly spread the recommended dose of powder around the entire perimeter of the pool, paying special attention to the areas in front of the water outlets.
- Keep the recirculation active for at least 2 hours to ensure proper product dispersion throughout the pool and that the filter begins to capture the first flocs.
- After this time, turn off the system and let the water settle for 8 to 12 hours depending on the level of dirt. The most practical approach is to apply the treatment in the evening and let it act overnight.
- The next morning, vacuum the accumulated residue at the bottom with the pool cleaner. Do this in drain mode (filter bypass) so that the flocs do not recirculate through the system.
- Finally, perform another filter backwash to clean the retained flocs and restart normal filtration. At that point, the water should already be noticeably clearer and more transparent.
If the water is very cloudy or has a greenish tint, apply a chlorine shock the night before flocculant treatment. The shock eliminates suspended algae, and the next day, the flocculant acts on the residues much more effectively.
In such extreme cases, it may be advisable to repeat the flocculation process after 48 hours to eliminate any particles that may have escaped the first treatment.
How often to apply natural flocculant?
The ideal frequency depends on pool usage, environmental conditions, and the quality of the filtration system. Below is a practical guide for each common situation:
| Situation | Recommended frequency | Observations |
|---|---|---|
| Preventive maintenance | Every 15 days | Keeps water crystal clear continuously throughout the season |
| Intensive use (summer) | Weekly | Many bathers generate more organic particles in suspension |
| After heavy rain | Immediately after | Rain carries dirt and unbalances treatment |
| Visible cloudy water | Immediate treatment | Combine with prior chlorine shock if algae are present |
| Season opening | Initial treatment | Apply after filling and pH adjustment, before the first swim |
| Area with a lot of wind or dust | Weekly or bi-weekly | Environmental dust quickly saturates the filter in these conditions |
Natural flocculant vs. aluminum sulfate flocculant: comparison
Before deciding, it's worth clearly seeing the differences between both options in the aspects that matter most in a family pool:
| Characteristic | Puerto Verde Natural Flocculant | Chemical Flocculant (aluminum sulfate) |
|---|---|---|
| Active principle | Natural components | Aluminum sulfate Al₂(SO₄)₃ |
| Format | Powder with scoop dosing | Liquid or granular |
| Clarifying efficacy | Very high | Very high |
| Speed of action | 8-12 hours | 8-12 hours |
| Effect on pH | Does not alter pH | Lowers pH (requires corrections) |
| Sensitive and atopic skin | ✅ Completely safe | ⚠️ May irritate |
| Children and babies | ✅ No restrictions | ⚠️ Greater caution recommended |
| Residues in water | None — biodegradable | Accumulable dissolved aluminum |
| Environmental impact | None | Contaminates soil and groundwater |
Tips for keeping pool water crystal clear all summer
Natural flocculant is very effective, but the best results are obtained when it is part of a complete maintenance routine. Here are the most important habits to keep your pool water in perfect condition throughout the season:
Filtration and system cleaning
- The pump should run a minimum of 8-12 hours daily in summer. Insufficient filtration is the most frequent cause of persistent cloudy water.
- Perform a filter backwash every 1-2 weeks during peak season to maintain maximum performance.
- Clean the skimmer and collection baskets every 2-3 days to ensure optimal water flow.
Water chemistry control
- Maintain pH between 7.2 and 7.4: this is the range where chlorine works most efficiently and water is most comfortable for eyes and skin.
- Control free chlorine between 1 and 1.5 ppm. If it is above 3 ppm, it can irritate the skin; if it is below 0.5 ppm, the water is exposed to bacteria and algae.
- Measure water parameters at least twice a week with a test kit or reagent strips.
Usage habits that make a difference
- Encourage bathers to shower before entering: sunscreens and sweat are one of the main sources of organic turbidity.
- Use a cover or thermal blanket when the pool is not in use to reduce the entry of dust, leaves, and outside organisms.
- Apply natural flocculant preventively every 15 days, even if the water appears clean, to prevent turbidity from accumulating invisibly until it's too late.
Frequently asked questions about natural pool flocculant
Below we answer the most common questions about the use of natural flocculant in domestic pools:
What is a pool flocculant and what is it used for?
A pool flocculant is a product that clumps suspended particles that are too small to be retained by a conventional sand filter. By combining them, it forms larger clumps (flocs) that the filter can capture, or that settle at the bottom to be vacuumed. As a result, the water regains its transparency and that crystal-clear appearance characteristic of a well-maintained pool.
How many scoops of flocculant do I need for my pool?
The reference dose is 2 scoops for every 10 m³ of water. Therefore, for a 20 m³ pool, you will need 4 scoops; for a 30 m³ pool, 6 scoops; for a 50 m³ pool, 10 scoops. If the water is very cloudy, you can slightly increase the dose according to the level of dirt. In addition, we have different product formats to suit any pool size.
How long should the water rest after applying flocculant?
After maintaining active recirculation for at least 2 hours to properly disperse the product, it is necessary to turn off the system and let the water rest for 8 to 12 hours, depending on the level of dirt. The most convenient way is to apply the flocculant in the evening/night and vacuum the bottom the next morning, when the flocs have completely settled.
Is natural flocculant safe for atopic and sensitive skin?
Yes, and that is precisely one of its main strengths. By not containing aluminum sulfate or any other metallic or synthetic compound, it does not generate the irritating residues that characterize conventional chemical flocculants. Therefore, it is the recommended option for families with children, people with atopic dermatitis, sensitive skin, or those who want to minimize chemical exposure during bathing.
Does natural flocculant alter the pH of the water?
No, unlike aluminum sulfate, which is acidic and lowers the water's pH with each application, Puerto Verde's natural flocculant does not alter the pH balance. This means you won't need to add pH correctors after using it, which simplifies maintenance and reduces the cost of additional products.
Is it compatible with all disinfection systems?
Yes, Puerto Verde's natural flocculant is compatible with all common disinfection systems: chlorine tablets, liquid chlorine, salt electrolysis, bromine, and UV systems. It does not interfere with any of them or modify their effectiveness, so it can be used with complete peace of mind regardless of the treatment system you have in your pool.
Where to buy natural flocculant for pools?
You can purchase our natural flocculant in our online store puertoverde.es, available in different formats with shipping throughout Spain. You can also find it on Amazon with Prime shipping if you prefer that option.
💧 Ready for crystal clear water naturally?
Powder flocculant · 100% natural · No aluminum sulfate · Suitable for sensitive skin · Shipping throughout Spain
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