We have a Pentair kit but I just ordered the recommended Taylor 2006C. We have a Hayward cartridge filter. This is our third season with the pool, the first with us trying to open it ourselves. We did have a hard time last year keeping the water in balance - it seemed to get green pretty easily and i felt like we lived at Leslie's. I don't know the CYA level because the kit I currently have doesn't support that but as soon as the new kit comes in I'm assuming I should be able to get that info. Thanks for your reply.