Salt water more trouble. U see ah 88$ for red sea coral pro 23kg make 600litre . If buy 400litre for 80$, its including deliveey amd topping the water to your tank. All takes only 15min . If make salt water, use 400litre of rodi, your cartridge will exhaust like supee fast + water bill and + have to mix it very well + have to measure the salinity and + will take 2-3days to make 400litre + waste time + have to carry pail pour in or use pump to pump in + later house floor become sticky have to mop + need super big water drum to store the water + if dont have, have to go buy . More mafan . LOL x:
1 DI refill is about 5$, 1 gac refil is about 5$ also. Carbon block about 9$?