Caware BCBC-20(10) 10 µ 20 inch x 4 1/2 inch Coconut Shell Carbon Block Cartridge Parts & Accessories there is no rule of

there is no rule of thumb

The CB-25-2001 Carbon Block Filter can also be used in a variety of locations

Weight: 10 lbs

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Sterilight BA-ICE-C Replacement Ballast for All Cobalt Basic Series Models

Caware BCBC-20(10) 10 µ 20 inch x 4 1/2 inch Coconut Shell Carbon Block Cartridge Parts & Accessories there is no rule ofCaware BCBC 20(10) 20 inch x 4 1 2 inch Coconut Shell Carbon Block Cartridge Features: Class 1 Chlorine, Taste & Odor Reduction Made with Premium Quality Coconut Shell Activated Carbon 10 Micron Filtration No Release of Carbon Fines Fits all Standard 20" Big Blue Full Flow Filter Housings 18,000 Gallon capacity @ 1 PPM Chlorine Flow rate: 6 GPM Cartridges are individually shrink wrapped. Manufactured by CA Ware.