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I’m using PoolMath for iOS on my iPhone. I started a slam this morning as I have higher than usual chlorine demand, despite the water being clear. I started with FC 1.5 and with a CYA of 40 the slam target is 16, for my pool it said that would be 3.3 litres of 15% chlorine like I checked about...

Hi, After a recent update, I'm seeing that I lose partially entered measurements if I change to a different app. This is the iPhone iOS version of PoolMath. I usually change to a different app, e.g. Chrome browser, to get the water temperature, but doing so causes PoolMath to forget any...

We completed construction of our pool last summer, this weekend we swam for the first time this year. I noticed some calcium noodles around the marble steps, one large one I crushed with my fingers - it was very white rock like, some larger pieces, but also lots of fine dust that I could not...

I’m having issues with what I think is calcium deposits, they are found on the bottom of the pool below the returns and on one of the steps. See photo After running the dolphin robot it’s filter was full of what I think is calcium deposits The pool is a 2 month old beadcrete in-ground pool...

Hi, I'm a new pool owner, pool was filled about 5 weeks ago. Up until last week I was manually adding dichlor and dry acid to keep the pool balanced, and didn't have any issues. Last week I added salt to 4000 ppm in preparation for the installation of a SWG, after adding the salt I had issues...

Hello, We just started construction of a pool at our house in Nicosia, Cyprus, it is an in ground pool, 2.8m x 8.5m, we plan to plaster it with beadcrete. I found this site researching options for a backwash pit, and so far I've learned a great deal. For example I learned that I should get a...