A Nature2 cartridge treats only 1000 gallons. OK for a hot tub but a little short for the swimming pool. I believe they are around $22. If I wanted to treat my swimming pool I would need 8 cartridges. Two years ago I used 8 gallons of CS and 1 gallon of CCu in my pool. Christmas tree customers were remaking how clean my pool water was. I can make CS much cheaper than the Nature2 cartridge but I leave for Arizona after Christmas and trust one of my sons to take care of the hot tub. He sometimes forgets. It might be better to buy a cartridge to use when I am down south, and he could pretty well forget the chemicals. Brickey
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