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In terms of frequency
but Effective In-Line Controller
Chemi-pure Blue should be changed every 2-4 months depending on bio-load
It really depends if you measure P/Po4 in PPB or PPM
Red Sea REEFER S-850 G3 Aquarium (180 Gallon Display) Color:Black Cabinet In terms of frequencyTHIS ITEM DOES NOT QUALIFY FOR FREE SHIPPING! Shipping charges on aquariums will vary by location. You will be contacted with further information. REEFER Concept The perfect reefscaping canvas REEFER G3 systems come with hydrodynamically superior water management, extra fortified cabinets & aquariums, REEF SPEC sumps with full high performance capabilities, integrated smart ATO systems and an extended warranty of up to 5 years. They are the ideal