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Puerto Verde natural alkalinity increaser for pools is a mineral product that gradually and controllably raises the total alkalinity (TA) of the water, without abruptly altering the pH. Maintaining alkalinity between 80 and 120 ppm is the basis for pH to remain stable over time: without correct alkalinity, pH constantly fluctuates no matter how many times you adjust it. Puerto Verde's alkalinity increaser is formulated with food-grade minerals, leaving no toxic residues in the water.
What is total alkalinity and why is it so important?
Total alkalinity (TA) measures the water's capacity to resist abrupt pH changes: it acts as a chemical "buffer" or "cushion." It is measured in ppm (parts per million), and the optimal range for pools is 80 to 120 ppm. When alkalinity is too low, the pH becomes unstable and varies from day to day even if you adjust it correctly; when it's too high, the pH tends to rise on its own, and the water can become cloudy.
Therefore, in pool maintenance, the same order is always followed: first, total alkalinity is adjusted, and only then is the pH fine-tuned. Doing it the other way around is the most frequent cause of pools where "the pH never stabilizes."
Very low<60 ppm
Low60–80 ppm
✓ Optimal80–120 ppm
High120–150 ppm
Very high+150 ppm
Pool water total alkalinity (TA) range, from lowest (left) to highest (right)
When do you need to raise your pool's alkalinity?
- The alkalinity test shows less than 80 ppm with test strips or photometer
- The pH constantly fluctuates even if you correct it every few days
- Eye or skin irritation in swimmers despite the pH appearing to be within range
- Visible corrosion on ladders, screws, or metallic elements of the pool
- After heavy rain or refilling the pool with very soft tap water
- After using excessive pH reducer, which also lowers alkalinity
- If you have just filled the pool for the first time or after a complete draining
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Looking for more pool products?
Discover the entire range of natural cleaning and maintenance products for pools. View collection →
Discover the entire range of natural cleaning and maintenance products for pools. View collection →
Advantages of Puerto Verde's alkalinity increaser
Natural mineral origin
100% mineral, no synthetic additives
Stabilizes pH
Prevents pH from fluctuating uncontrollably
Protects equipment
Reduces corrosion of pump, filter, and ladders
Safe for swimmers
No irritants or toxic residues in the water
Fewer products, less expense
With stable TA, you need to adjust pH much less
Biodegradable
No negative impact on the environment
Natural alkalinity increaser vs. conventional products
| Feature | Natural Alkalinity+ | Conventional synthetic products |
|---|---|---|
| Origin | Natural mineral | Industrial synthetic |
| Effect on pH | ✓ Minimal, controlled | ✗ Can alter it excessively |
| Risk of overdosing | ✓ Low | ✗ High |
| Skin/eye irritant | ✓ No | ✗ Yes in concentration |
| Biodegradable | ✓ Yes | ✗ Not always |
| Salt / UV compatible | ✓ Yes | ✓ Yes |
| Stabilizes pH long-term | ✓ Yes | ✗ Temporary effect |
| Safe household use | ✓ Yes | ✗ Requires caution |
How to apply the alkalinity increaser step by step
⚠ Before you start: Always adjust alkalinity before pH, never the other way around. Never mix the alkalinity increaser with other products in the same bucket or add it to the water at the same time as chlorine. Wait at least 30 minutes between adding each product.
- Measure current alkalinity: Use test strips, a liquid test kit, or a digital photometer. Note down the value — you need to know how much to raise it to calculate the dosage.
- Calculate the dose: Use the pH and alkalinity calculator to get the exact grams according to your pool volume and the required TA increase.
- Dissolve the product: Add the calculated dose to a bucket with clean pool water. Stir until completely dissolved. Never add it directly as powder to the water.
- Pour with pump running: With the filtration system running, slowly distribute the solution around the perimeter of the pool, especially near the water returns.
- Wait 4–6 hours: Let the pump circulate the water so the product distributes evenly before re-measuring.
- Re-measure alkalinity: Check the value. If it is still below 80 ppm, repeat with a smaller additional dose. Never add large doses at once.
- Adjust pH afterwards: Once alkalinity is within range (80–120 ppm), measure and correct the pH with a pH increaser or reducer as appropriate.
💡 Pro tip: If you notice the water becomes cloudy after raising the alkalinity too much at once, our natural flocculant calculator might help clarify it again.
Approximate dosage of alkalinity increaser according to volume and required increase
The indicated doses are approximate for raising total alkalinity by approximately 10 ppm. For larger increases, calculate by multiplying or use the calculator.
| Pool volume | 10 ppm increase | 20 ppm increase | 30 ppm increase |
|---|---|---|---|
| 20 m³ | 300 g | 600 g | 900 g |
| 32 m³ | 480 g | 960 g | 1,440 g |
| 50 m³ | 750 g | 1,500 g | 2,250 g |
| 64 m³ | 960 g | 1,920 g | 2,880 g |
| 80 m³ | 1,200 g | 2,400 g | 3,600 g |
Actual values may vary depending on pH, temperature, and water hardness. Always use the pH and alkalinity calculator for greater accuracy.
The relationship between alkalinity and pH stability
Total alkalinity acts as the water's "buffer": the lower it is, the easier it is for the pH to spike up or down due to any external factor (bathers, rain, chlorine, temperature). With TA below 60 ppm, the pH can vary by more than 0.3 units in a single day. With TA in the optimal range of 80–120 ppm, the pH remains stable for several days even with intensive pool use.
| Total Alkalinity (TA) | pH Stability | Status |
|---|---|---|
| <60 ppm | Very unstable, changes daily | ✗ Too low |
| 60–80 ppm | Slightly unstable | ✗ Low |
| 80–100 ppm | Stable | ✓ Optimal |
| 100–120 ppm | Very stable | ✓ Optimal |
| 120–150 ppm | pH tends to rise on its own | ✗ High |
| +150 ppm | Cloudy water, scaling | ✗ Too high |
Frequently asked questions about natural alkalinity increaser
What is the difference between alkalinity and pH?
They are distinct but related parameters. pH measures the current acidity or alkalinity of the water at the time of measurement. Total alkalinity (TA) measures the water's capacity to resist changes in that pH; that is, it acts as its "buffer." You can have a correct pH one day and see it out of control two days later if alkalinity is poorly adjusted: that's why alkalinity is always corrected first, and then pH.
How long does it take for alkalinity to rise after applying the product?
The product begins to dissolve and act within 30–60 minutes, but to see the full and uniform effect throughout the pool, it is advisable to wait 4–6 hours with the pump running before re-measuring. Avoid measuring immediately after adding it, as the concentration near the pouring point will be higher than in the rest of the water.
Can I swim after raising alkalinity?
Yes, as long as the free chlorine is between 1–3 ppm and the pH is within a reasonable range. Wait at least 4–6 hours after application for the product to distribute well throughout the pool before resuming normal swimming.
Why should I raise alkalinity before pH?
Because alkalinity is what stabilizes pH, not the other way around. If you adjust pH with low alkalinity, the pH will fluctuate again in a few days, and you will have to correct it over and over, spending more product than necessary. By first adjusting alkalinity (80–120 ppm), you ensure that the pH, once corrected, remains stable for much longer.
How often should alkalinity be checked?
It is recommended to measure total alkalinity once a week during the swimming season, and whenever you notice that the pH easily goes out of control. Unlike pH and chlorine, alkalinity changes more slowly, so it is not necessary to measure it daily.
Is the alkalinity increaser compatible with saltwater or UV pools?
Yes, completely. It is compatible with all disinfection systems: conventional chlorination, salt electrolysis, UV, ozone, and copper-silver. In fact, in saltwater pools, maintaining alkalinity within the optimal range helps the electrolyzer work more efficiently and last longer.
Why does my pool's pH constantly drop or rise?
The most common cause is low total alkalinity (below 80 ppm), which means the water lacks buffering capacity, and the pH reacts excessively to any factor: rain, swimmers, temperature, or chlorine itself. The most effective long-term solution is to raise total alkalinity to 80–120 ppm with the alkalinity increaser, and from there, pH will be much easier to maintain.
What happens if I overdo it and raise the alkalinity too much?
Alkalinity above 150 ppm can cause the pH to tend to rise on its own and the water to become cloudy or prone to scale formation. If you have overdone it, the way to correct it is by adding a pH reducer in controlled doses, which also slightly reduces alkalinity, and re-measuring after a few hours.
Can I use the alkalinity increaser in a natural pool or biopool?
Yes. It is a natural mineral completely compatible with biopool and phytopurification systems, without negatively affecting microbiology or purifying aquatic plants. It is precisely the recommended option for this type of installation.
How much product do I need for the whole season?
It depends on your pool's volume, the quality of the fill water, and the frequency of rain or refills. As a reference, a 30–35 m³ pool with intensive family use can consume between 1 and 2 kg of alkalinity increaser throughout a season from May to September. Use the pH and alkalinity calculator to estimate the consumption for each correction.
Where can I buy natural alkalinity increaser for pools online in Spain?
You can buy Puerto Verde's natural alkalinity increaser directly from this collection, with shipping throughout the peninsula, along with other natural pool cleaning and maintenance products.
Don't know how much alkalinity you need to raise?
Enter your pool volume and current alkalinity, and we'll calculate the exact dose instantly.
