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Hi all, considering purchasing an RO/DI system. I have an aqua one aquareef, 300 litres with approx 40 litre sump. Is a 5 stage RO/DI system overkill? Would a 3 stage be alright? Looking something affordable and practical. Ideally one that can be hooked up when needed and packed away after, something compact. Is it cheaper to replace cartridges, are there systems in where you only replace the fillings? Any advice appreciated.
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