Pool is almost 2 years old and I've bought pucks from 3 different pool stores and amazon. I recently took 3 water samples to 3 different stores: 1. Leslies's, 2. Pinch a Penny 3. A small family owned independent store with super nice owners and got 3 different recommendations, each of which involved buying things they coincidently carried that would fix all my problems I didn't know I had. I was venting to a buddy about it and he told me he used TFP years ago and it was great so here I am. Been reading and reading and its a lot to take in but it definitely seems to be the way to go so I'm going to give it a try. Thanks for all the info.