Just place unit in pump basket or skimmer on side of spa.
The PoolRX Unit is good for up to 400-1000 gallon spa.

The PoolRX® Booster is sufficient for a pool up to 10,000 gallons or is needed for pools with gallon capacities greater than 20,000 gallons.

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Nature 2 Spa Purifier W20750 Treats 1000 gallons

Just place unit in pump basket or skimmer on side of pool.
The PoolRX Unit is good for up to 20,000 gallon pool

Just place unit in pump basket or skimmer on side of pool.
The PoolRX Unit 331066 is good for up to 30,000 gallon pool.

Instant Pool Frog pools up to 25K

Pool Frog Mineral Reservoir fits inside the Pool Frog 5400 series Frog Units 01-12-5462

Nature 2 Cartridge Filter Purifier W29500 CF Cartridge Filter Purifier for Pools to 25,000 Gallons

Nature2 Replacement Cartridge Aboveground Pools A30 W28165

W28175 Cartridge Zodiac Lasts 6 Months

Nature2 Cartridge N2CG45 W28125

Nature2 Professional G Cartridge N2CG25 W28125

W28000 Zodiac DuoClear Nature2 Replacement Cartridge Water Clarifier 25K

W28001  Zodiac Nature2 Replacement Cartridge Water Clarifier 35K

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The Nature2 Professional W28145 replaces W26745

Zodiac DuoClear Nature2 Replacement Cartridge Water Clarifier 45K W28002

Nature2 Express Express Vessel and Cartridge, Complete In-Ground Pool Purifier W20086 Nature2 Saves on chlorine.

Paramount 005422901500 2-Lamp Kit with Boot and O-Ring for HydraPure and Ultra UV2 Sanitizers

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Dramatically reduce chemical demand by up to 50% 230V

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Nature2 W25904 Crystal Clear Water (cartridge not included)

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Save up to 50% per year on chemical use - 120V model

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Dramatically reduce chemical demand by up to 50% 230V

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Pool Tiger protects against scale by preventing minerals from adhering to pool surfaces

The Pond Pool Tiger protects against scale by preventing minerals from adhering to pool surfaces