Hello. This is my second year with a pool and I thought I knew what I was doing. This year I have a constantly mustardy/green pool. I have a lot to learn and a lot of questions. Thank you for letting me listen to all yours.
Welcome, I suggest as a first step to read pool school link in the upper right a couple of times, and if you don't have one order one of our suggested test kits right away, the sooner you get a good test kit in hand the sooner you can start taking control of your pool, until then your flying blind, or partly blind, I use the TF-100 (link in my signature).
Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!