Re: The Great Tetraborate Experiment!
If you are draining water when it rains then the borate levels will go down, along with the rest of your water balance going 'off'. If you just let the water evaporate then the levels will go back to where they need to be. If your pool is overflowing from the rain then you will lose not just borates but also other levels in your pool will be off, CYA, Salt, chlorine, TA, CH, all of them! How are you testing your borates. Also realize that they just need to be between 30-50 ppm so if they are not exactly at 50 ppm then I would not worry too much about it. If you had a SWG you would be having exactly the same problem with your salt levels, btw. You would also have the same problem with CYA if you are using an unstabilized chlorine source and adding CYA to your target ppm so I don't really understand why you are having problems maintaining the borates.
Retired pool store and commercial pool maintenance guy.
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