HydroSurge Swim Spa Serum | Weekly Swim Spa Water Care Brand_SimpliFire 2" on this one —

2" on this one — and the part numbers are one digit apart

2 pork chops

Glance at the top of your old cartridge

Jacuzzi Premium

Dimensions 51 1/2" x 6 1/8"

HydroSurge Swim Spa Serum | Weekly Swim Spa Water Care Brand_SimpliFire 2" on this one —HydroSurge Swim Spa Serum is a concentrated weekly water care product built specifically for swim spas. It uses the same proven technology as Hot Tub Serum Total Maintenance, reformulated at four times the strength so it can treat the much larger water volume of a swim spa cost effectively dosed at just 1 ounce per 500 gallons instead of 1 ounce per 100. Swim spas face the same hidden problem as hot tubs, only bigger: residue and buildup that