Swimming Pool Water Chemistry And Its Worst Enemy

swimming pool water chemistry

Believe it or not, the worst thing you can do to your swimming pool water chemistry is add water to it.

Now this might sound counterintuitive because your swimming pool is filled with water but it’s actually true… You see, your swimming pool consists of more than just water, which is why, when you initially fill your pool with a hose or any fresh water source, it is not automatically clear. The water usually has a cloudy and greenish hue to it. This is partially due to the fact that the water is stagnant and needs to filter out but the other half of the equation is your swimming pools water chemistry.

Generally speaking when people think of their swimming pool water chemistry, they simply think of a sanitizer, which is almost always chlorine. When in reality chlorine is only 1 of 5 separate chemicals necessary to maintain balanced swimming pool water.

The main factors or parameters that determine water balance are chlorine, pH, calcium hardness and total alkalinity; with chlorine stabilization being a must in Miami.

Learn a little about your swimming pool water chemistry:






(There will be a separate post specifically for water chemistry and balance as to not go into too many details for the significance of each chemical.)

Each of these swimming pool chemicals serves a different purpose but works together with the rest in order to maintain healthy swimming pool water. For this reason, each has its own ideal range measured in parts per million (ppm). Some even directly affect another, which is why it is so important that they all be consistently kept at their proper levels. If one chemical strays off it could potentially affect another and result in a green swimming pool.

Now that you have a better understanding of what’s involved in your swimming pool water, you can start to better understand why adding fresh water would have a negative affect on the balance of your water chemistry.

Fresh water dilutes your swimming pool chemicals.

Adding fresh water to your swimming pool kills all of your chemicals simultaneously. It raises your ph, depletes your chlorine, and lowers your alkalinity, calcium and stabilizer.

This can become a virtual nightmare for anyone adding water on a consistent basis. If your throwing your hose in the pool every week, your swimming pool water will most likely never be crystal clear.

The problem with hose water is that aside from depleting your swimming pool chemicals, it also introduces other micro-organisms and metals into your pool because it is not 100% pure H2O like rain water is…

swimming pool water chemistry

If you ever take the time to notice, a well maintained swimming pool, after SOME rains when the sun comes back out, will look pristine and have that extra “sparkle” to it…  That’s because pure rain water being added to pool water dilutes the chemicals but also replaces the dissolved solids and microscopic matter with nothing but pure H2O.

swimming pool water chemistry

Instead, hose water adds to the already existing microscopic matter and dissolved solids with more microscopic matter while also diluting your chemicals. This is why the water almost immediately begins to become cloudy.


For these reasons we absolutely recommend refraining from any auto-fill system for your swimming pool.  They are nothing but a nightmare!

If your pool leaks and you have no other choice but to continue to add water then we suggest adding water the day before your service day. (same day if possible) This way your chemicals can be rebalanced ASAP.

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