BluWater 10,000 Gallon Pre Filter [5 Microns] [Carbon Block] (PF 100) andersonmfg and this Jacuzzi EW36 Manifold and this Jacuzzi EW36 Manifold and Grid Assembly is designed for compatible applications where the original internal assembly has worn out or become unreliable Replacing a combined grill and flow path component is often a cleaner repair than trying to piece the seat back together one small part at a time 000 Gallon Pre Filter is designed for compatible applications using a 5 micron carbon block format A pre filter like this is especially appealing at fill or refill time because it helps improve the quality of the water before it enters the system