I have a couple of questions looking for help. I've had a pool most of my life and I have never had issues like I have now. I'll start with the beginning I've always took a sample to local pool store for opening the pool and followed their direction to a T. Last year they had my put stuff in I've never used before. Not sure on what it was. But water turned cloudy and never cleaned up. Opened pool this yr and same results water cloudy and wont clean up. I've now drained pool and filling back up. I've order the taylor test kit 2006c. I've looked multiple places and my pool is anywhere between. 17500 g to 20000 g. It's a round 27 ft 54 inch deep. Someone have a exact amount? Where is the best place to purchase chemicals? Any brands to avoid. I've read thru the abc's of pool chemicals and hopefully I can follow it to a T