Hayward Goldline Turbo Cell T-Cell-9 25,000 GallonThe T-cell-9 model Turbo cell is only compatible with the following models and will not work with earlier versions:AQR (AquaRite) -all 2009 or later- firmware 1.5 or laterAQR-PRO (AquaRite Pro)- firmware 1.10 or later PL-P-4 (Pro Logic P4)- firmware 4.1 or later PL-PS-x (Pro Logic PS)- firmware 4.10 or later Turbo Cells come in three sizes for in-ground pools – 40,000, 25,000 and 15,000 gallons. The three sizes enable you to right size your salt system for the most efficient and cost-effective chlorination possible. The Turbo Cells automatically generate a self-renewing supply of fresh, pure chlorine for water that's clean, clear and luxuriously soft. Pick N' MixAqua Rite, Aqua Rite Pro and Pro Logic do not come equipped with a Turbo Cell. They are required with Aqua Rite and Aqua Rite Pro, optional for Pro Logic. Pick and Mix the Turbo Cell and other options right for you. Turbo Cells come equipped with Aqua Plus, SwimPure Plus and SwimPure Plus with Controls – all 40,000 gallon Turbo Cells.