Which cell fits a Hayward AquaRite 900
The AquaRite 900 is not the same controller as an AquaRite, and its own manual points at different cell part numbers. Check your controller model before you buy anything, because the listing will not tell you.
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The trap on this system
The base AquaRite manual and the AquaRite 900 manual both use the same on-screen settings, t-3, t-9 and t-15. They do not point at the same parts. The 900 series manual names part numbers that appear nowhere in the base AquaRite manual, so two owners reading the same setting on the same brand can need different parts.
What Hayward's 900 manual actually says
"t-3" = if using a T-CELL-3, GLX-CELL-3-W "t-9 = if using a T-CELL-9, GLX-CELL-9-W. TCELL925 "t-15" = f using a T-CELL-15, GLX-CELL-15-W, T-CELL-15LL, TCELL940 "t-5" = if using a GLX-CELL-5, GLX-CELL-5-W
Hayward AquaRite 900 series owner's manual, 092623 RevD
Work out which controller you have first
The AquaRite 900 series covers the AQR940 and AQR925 controllers. The model number is printed on the controller enclosure, and it is what decides which cell setting and which cell part number apply.
This matters more on this system than on almost any other in the category, because the searches people run are for the cell, and the answer depends on the box.