Hi and WELCOME! So tell us about this pool. Is it a new built pool or new to you as in you moved into a house that had a pool. I think I already know the answer but don't want to mess you up if I get it wrong!
To help us help you even better could you please fill in your signature. Go to your username, click on it. You should see "signature". Put in your pool kind-in or above ground, plaster, vinyl, plaster, fiberglass? Filter kind-sand, cartridge, DE. Any special features your pool might have. Lastly what test kit you are using.