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If your filter's top closure is leaking
providing the structural interface between the filter body and the connecting pipework
Your Pentair Clean & Clear Plus 320 and Waterway Crystal Water 325 require 4 cartridges for a complete service
Replacing both nuts together (as Pentair specifies) ensures uniform clamping load and a long-term leak-free seal
Waterway 2 Speed 4.5HP 230V Spa Pump | 3421821-1A C9410 If your filter's top closureFeatures and Benefits: Executive wet end designed specifically for 48 frame motors Large 6 " diameter wet end for higher head pressure and energy efficiency Thermally protected to extend life expectancy of motor Highly versatile wet end can be rotated every 90 deg Silicone carbide seals, viton bellows, 316SS casing, corrosion resistance against chlorine, bromine & salt
