Is it possible to have a perfectly balanced pool? How do you balance a pool? What is a balanced pool? Is it like Anakin bringing balance to the Force? And last at what point is a pool considered balanced? These are all things I get asked often (minus the Star Wars Nerd Question) and the answer is just as elusive as these questions.
Let’s start with the first question which is can you have a perfectly balanced pool? Here are some ideal pool parameters and although they all differ slightly, these are the preferred ranges across the industry.
Free Chlorine 1.0-3.0 ppm
Combined Chlorine 0 ppm
Bromine 4.0-6.0 ppm
Total Alkalinity 80-120 ppm
Calcium Hardness 200-400 ppm
Cyanuric Acid 30-50 ppm
TDS below 2000 ppm
ORP 650 or above
Is there a way to adjust these readings in your pool to get them within these ideal ranges? The answer is yes, with enough trial and error you can get your test factors to line up with these guidelines.
The next question was how do you balance a pool? Basically, if the pH is high you would add an acid like Muriatic Acid to lower down. If the pH was low you would add a base to bring it up. If the Cyanuric Acid level is at 100 ppm you would drain 50% of the water to drop it back down to 50 ppm. So by adding chemicals or by partially draining your pool, you can get your reading within these ranges. That is more or less the easy part.
What exactly is a balanced pool is the question I think that should be asked. Is having all of your readings in line with the above chart a balanced pool? Technically no. Because what we are balancing is not these recommended parameters but the water quality itself. Keeping the free chlorine in the range is obviously important because if it gets too low the water may not be safe to swim in since it is the chlorine acting as the sanitizer in the water that kills viruses, bacteria, and pathogens. But to truly have a balanced pool you really need to be looking at the LSI (The Langelier Saturation Index).
The LSI is an index that was developed to indicate if a particular body of water was either scale forming or acidic in nature. If for example, your pH is 6.5 it is in the acidic range and the pool water would be corrosive. If the pH was 8.4 and the Alkalinity was 150 and the Calcium Hardness was 350 the water would be scale forming. Both of these are not good and one reason that it is important to shoot for the ideal ranges is to prevent the pool water from going in one or the other direction, either corrosive or scale forming.
To achieve a balanced pool you really need to calculate the pool’s LSI. This takes into account many factors including water temperature, pH level, ALK level, CYA level, Calcium Hardness, and the pools TDS (Total Dissolved Solids) to come up with the range. The closer you get to 0.00 to +.30 the more perfectly balanced your pool water will be. The interesting thing is that you may think your pool is balanced but unless you plug your numbers into a good LSI calculator it may actually be scale forming or corrosive. One of the best LSI calculators can be found on the Orenda website here:
So the short answer is you can come close to having a perfectly balanced pool but if you are not using the LSI index in some fashion, you really are just guessing even if you keep your pool within the ideal ranges.
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