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Puerto Verde is a Spanish brand that makes natural products for pool water maintenance: a pH+ increaser, a pH- reducer, an alkalinity increaser, and a natural flocculant. All four are of mineral or plant origin and biodegradable, and together they cover the complete chemical maintenance of a pool: stable, clear water that is safe for the whole family.
What products make up Puerto Verde's natural pool maintenance?
pH+ increaser
Gradually and controllably raises the water's pH to protect swimmers' skin, equipment, and chlorine effectiveness.
View pH+ increaser →
pH- reducer
Lowers the water's pH with a ready-to-use liquid formula when it spikes above the optimal range and reduces chlorine effectiveness.
View pH- reducer →
Alkalinity increaser
Stabilizes the water's total alkalinity so that the pH stops rising and falling uncontrollably. It should always be applied before the pH increaser.
View alkalinity increaser →
Natural flocculant
Clumps together suspended particles that cloud the water, leaving it crystal clear in 24-48 hours without altering the pH.
View natural flocculant →The links in this section point to each product's collection — check that the URLs match the actual handles of your store before publishing, especially the one for the pH- reducer.
pH and alkalinity calculator Calculate the exact dose of pH+ increaser, pH- reducer, or alkalinity increaser in seconds Natural flocculant calculator Calculate the flocculant dose according to your pool's m³
Which product do I need? Quick comparison by symptom
| What you see in your pool | Recommended product |
|---|---|
| The pH reads below 7.2 | pH+ increaser |
| The pH reads above 7.6 | pH- reducer |
| The pH rises and falls constantly even though you correct it | Alkalinity increaser |
| Total alkalinity below 80 ppm | Alkalinity increaser |
| Cloudy, milky, or unclear water | Natural flocculant |
| Green water after shock treatment with dead algae | Natural flocculant |
| Opening the season with stagnant water | Alkalinity increaser + pH+ or pH- + flocculant |
| Irritation in swimmers' skin or eyes | pH+ increaser, pH- reducer or alkalinity, depending on the test |
Complete natural water maintenance routine
The order of application matters: correcting in the wrong order means you have to repeat the treatment and use more product than necessary.
- Measure the water: total alkalinity, pH, and chlorine, with test strips, a liquid kit, or a digital photometer.
- Adjust the alkalinity first: bring it to the 80–120 ppm range with the alkalinity increaser. It is the step that stabilizes everything else.
- Then adjust the pH: once the alkalinity is in range, correct the pH to 7.2–7.6 with the pH+ increaser if it is low, or with the pH- reducer if it is high.
- If the water is cloudy, apply flocculant: with the pH already in range, use the natural flocculant to leave it crystal clear, always with an active sand or glass filter.
- Measure again: check alkalinity, pH, and chlorine again after each correction before swimming normally.
Why choose Puerto Verde's natural maintenance?
🌿 100% natural No unnecessary synthetic additives in any of the four products
♻️ Biodegradable They leave no toxic residues in the water or soil
🛡️ Safe for the family Suitable for sensitive skin, children, and pets
🔋 Formats for every need Dosable powder and ready-to-use liquid, depending on the product
🇪🇸 Spanish production Project committed to local employment and the environment
Before buying, check the compatibility of each product with your specific disinfection system on its product sheet: not all our products are suitable for pools with salt chlorinators.
Frequently asked questions about natural pool maintenance
What is natural pool water maintenance?
It consists of adjusting the water parameters —pH, total alkalinity, and turbidity— with products of mineral or plant origin instead of harsh synthetic compounds such as caustic soda or aluminum sulfate, reducing irritation to the skin and eyes and the environmental impact without losing effectiveness.
In what order should I treat my pool water?
The correct order is: first total alkalinity (80–120 ppm), then pH (7.2–7.6), and finally, only if the water remains cloudy, the flocculant. Adjusting the pH before alkalinity is the most common reason why the pH "doesn't stay stable" no matter how much you correct it.
What is the difference between the pH+ increaser and the pH- reducer?
They correct the pH in opposite directions: the pH+ increaser raises the pH when the water is too acidic (below 7.2), while the pH- reducer, in liquid form, lowers it when it is too high (above 7.6). Always measure the pH before deciding which of the two you need.
What is the difference between the pH+ increaser and the alkalinity increaser?
The pH+ increaser corrects the water's acidity at the moment. The alkalinity increaser stabilizes that correction over time, acting as a "buffer" that prevents the pH from becoming uncontrolled again in a few days. Both are needed for long-lasting maintenance, in that order.
When do I need to use flocculant instead of a pH or alkalinity corrector?
Flocculant is used when the problem is the turbidity of the water (dust, dead algae, sand after a storm), not the pH or alkalinity. Before applying it, it is advisable to check that the pH is between 7.0 and 7.4, as outside that range the flocculant loses much of its effectiveness.
Are these products compatible with each other?
Yes, they are designed to be used complementarily within the same maintenance routine (you will never need the pH increaser and reducer at the same time, only one depending on your measurement). The only thing to respect is not to mix them directly with each other or with chlorine in the same bucket, and to wait at least 30 minutes between the application of each one.
Are they safe for pools with UV disinfection, ozone, or bio pools?
Check each product's sheet: compatibility may vary between the pH+ increaser, pH- reducer, alkalinity increaser, and natural flocculant depending on the disinfection system you use. In general, all avoid the irritants inherent to synthetic correctors, which reduces discomfort to the skin and eyes compared to conventional alternatives.
How often should I check the pool water?
During the swimming season: chlorine and pH are measured 2–3 times a week, total alkalinity once a week, and flocculant is only applied occasionally (1-2 times per season or when the water becomes cloudy). Always use the dose calculators to avoid over- or under-dosing.
Where can I buy natural products for pool maintenance in Spain?
You can buy the pH+ increaser, pH- reducer, alkalinity increaser, and natural flocculant from Puerto Verde directly in this collection, with shipping throughout the mainland and free calculators to find the exact dose before buying. You can also find them in our official Puerto Verde Amazon store.
Don't know what dose you need?
Use our free calculators and get the exact dose for your pool in seconds.
