Actually I find that replacing all of the cartridges is the best solution, and they are not that expensive. I have been buying them from Kevin @ Red Coral and the pricing is quite low.
Now I don't run DI, so I can't say what cost is there, but carbon, media filter and membrane was like $30 or so bucks for everything from Kevin.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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