I am a new (1st year) pool owner (14000 gal in ground painted concrete) and the local pool store has been my weekly hangout spot over the last few weeks. I've got a MAJOR algae bloom and can't seem to shake it. The guy mentioned TDS (total dissolved solids) and said mine was at 1100. I didn't know what the heck he was talking about and just stood there like a deer in headlights. I've been taking everything the store has said as gospel, then found this forum. THANK GOD I DID!! I'm super upset that I've spent hundreds of dollars on chemicals that only further exacerbated my problem. Now my CYA level is at 100 and I can't kill this algae even with strong algaecide. I'm in the process of draining 30% of my water and refilling to see if that helps the CYA level and then switching to bleach. I'll be ordering the tf100 testing kit as soon as I have the extra money, but for now I'll just have to rely on testing strips and just shocking the **** out of it. Any suggestions would be greatly appreciated as to how to make this work as quickly as possible would be awesome.