Hi. New to the forum. Checked back a few pages and don't see my problem addressed. We have a 24ft, 48" deep, round AG pool. It has a vinyl liner and a sand filter. The pool, liner & filter are approximately 13 years old. We've been in the house 6 years so we replaced our filter sand last year. Our water source is well water (recently tested negative for copper with a trace amount of iron). I'm in southern Ontario and our pool season runs from late May to early September.
Up until last year we'd never had any problems with water quality or staining. Starting last year we had a minor amount of yellowy-brown staining on the walls of the pool. I put it down to my husband neglecting to clean the walls before he filled the pool in the spring and as it was very minor we lived with it. We're in a rural area and this past winter we had a major windstorm that blew soil from the surrounding fields all over the place - some of this soil would have got into the pool when the winter cover was partially blown off due to the high winds. This year my husband again didn't clean the walls before filling up the pool. After filling up the pool in the spring and clearing the water, we noticed we had staining on the floor of the pool together with the walls. This gave the pool a decidedly green appearance. When tested, the water analysis figures were always within acceptable parameters. I started doing research on the internet and read about the vitamin C test. Tried it and watched the stains disappear before my eyes. Bought Stain Free and Metal Free and used them according to instructions. The pool turned beautifully blue and totally crystal clear within 12 hours, but when I woke up the next morning, the water had a white, cloudy appearance. Took a sample to our pool store and all levels tested fine with the exception of chlorine which was nil (as per the instructions on the bottle). Pool store told us to add chlorine which we did only to see the pool turn a cloudy green colour. Over the next few days, as the chlorine levels dropped, the water returned to a blue colour, but it was somewhat cloudy. Phoned Natural Chemistry and they said to add DE to the filter, put in another bottle of Metal Free, run filter continuously for 24 hrs and then backwash and add chlorine slowly. Put the Metal Free in and once again and water turned blue, but still a bit cloudy. After 24 hours I backwashed and then I added a litre of liquid chlorine and the pool water has turned green again!. I'm getting quite frustrated. Everything that I'm reading points to this being a metal problem, but both pool and well water are testing negative. One site that I was on where someone had the same problem said to add HTH Pool Stabilizer to clear the water.
Does anybody have any idea what I can do to get clear water again?