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Moved into a house a couple of years ago. Existing pool. Last summer was the first we had use of the pool and I noticed I'd clean the pool but a day later it was dirty. I later realized it was sand. I did some research and figured the sand was either worn down or a lateral was damaged. I...

Hi, New pool owner here...bought a house with a pool that is about 9 years old. In ground pool Vinyl liner 100000 litres approx Sand filter Located in Ontario, Canada (pool is closed for winter obviously) I have the TF-100 test kit CYA is about 35 (hard to tell but roughly) TA is 130 PH is 7.5...