I needed to add 2-3 inches to the pool yesterday, and instead of dragging out the long hose reel and stringing it across two yards to get to my father-in-law's municipal water supply -- the only water I've ever used to fill and refill my pool -- I got lazy and decided to just use our nasty well water. I thought I could be clever and put the hose directly into the skimmer, thinking the D.E./cellulose filter would somehow make a difference. But I could tell as the day went on something wasn't quire right, and this morning when it's overcast I could see an obvious greenish tint to the water. Even my 10-year-old disabled daughter noticed it right away! I tested last evening around 6, after the kids had been in it, and I had 3 FC and 0.5 CC, so I added 20 oz. of 12.5% chlorine. This morning the numbers are good -- 5.5 FC and 0.0 CC (pH both days a perfect 7.5), but the color has me bummed. Is this rust? What is going on?
(Side note: Water wasn't the only variable yesterday, as I also added the new Confer steps to the pool. They are weighted down my three bleach jugs filled with sand, water and a little chlorine and sealed tightly. Is this a factor in any way?)