Test results - bluish cloudy pool

[4KidsSwim]

Thanks for the quick responses.

I am certain my ph hasn't gone past 7.8, unless my test kit is bad (grin). I'm guessing it is scaling on the walls. I haven't tried washing it off at all because it is not a priority to worry about it, so I don't know if acid would foam. Basically, if I rub the side of the pool above the water level with my finger, it takes a minute before the wall comes clean. I'm assuming it's mineral deposits because that's just the kind of water we have.

Regarding holding chlorine overnight, I haven't noticed any significant drop, usually just 1 or 1.5 loss each day with just our family using it. My understanding was that if there is organic matter in the pool it would be "eaten" by the FC, which would produce CC, so if my CC reading is 0, its clean. (This is the "I'm not a chemist" understanding.) Am I a bit off in my thinking on this? Should I give it a shock just in case, or is that a waste of bleach with 0 CC?

If the alk truly isn't a problem, I may just ignore it, except to pull down the ph again, since I have mur. acid on hand. Wouldn't mind NOT storing if for the winter.

[duraleigh]

I don't think that's scale....it would not come off with your fingers and I don't believe it would normally precip out onto the vinyl. Shocking the pool is a painless, inexpensive possible fix.

You really use little if any extra chlorine....it simply stays in the pool at higher concentrations for a while. I'd bring the Cl up to a solid 15 one evening and test again the next morning. If you have a large drop, you'll have found the issue. Once or twice will probably return the water to the crystal condition you had.

Let us know what you find.