We have had our pool for about 3 years. Getting it ready for summertime . I have no heater, we keep pump running all the time. When brushing pool today I noticed there is an aqua color on the surface of the pool. It does not come off. Has a few tiny black dots also. I took water to the pool store and it says copper is at .20 . Which I’m assuming is .2. Which that’s not high. I checked the cooper lever because goggle says to high of copper will turn granite aqua in places. So I’m trying to find out what else it could be. We use a
Jandy Zodiac W28000 Duoclear & Fusion 25 Replacement Mineral Cartridge
We change it every six months. So my question is what can I do
