Greenie

Thank you, we will follow your instructions. We did Shock when the pale yellow color was coming back on the sides. Do you use sand filter cleaner? Purchased Doheny's but haven't used yet. We Backwashed and rinsed several times.

we did shock the pool with two bags of shock for 19,000 gallon pool, did nothing and still waiting for chlorine to balance. the citric acid worked so well at first, the fiberglass on our pool is yellowing again, not as bad as before. we will wait til we can get the chlorine in balance. My chemist brother in law says algaecide and chlorine cancel each other out. the pool supply People told us to use algaecide, but it did nothing for the yellow stain or cloudy water. will just wait. Thank you for all your helpful comments.

We can see the bottom of the pool now and will let it be for a few days. any suggestions welcome

So glad to see people having the same issue we are. Added a citric acid mix to remove stains and it worked great.pool was so clear. Didn’t realize it was messing with the chlorine levels. Our pool is now cloudy for a few days. Shocked the pool with two bags and still cloudy, noticed chlorine levels aren’t going up like they should. No more citric acid. Was thinking we had to replace sand in our filter!