Currently I am making about 250 L per month with my RODI system (Aquactic Life RO buddie 100 GPD). I used to be much more picky on when to change the cartridges. Right now the Deionization (DI) cartridge probably needs to be replaced (and will do so in a month or two), but I am still getting water with a TDS of 4-5 ppm. When all the cartridges are brand new I get about 1-2 ppm. A
3 piece bundle usually sets me back around $40... Carbon, Sediment and Deionization - the membrane is $30. Aquactic Life claims a lifetime of 6 month or 6000 L (for the Sediment and Carbon filters) but it will vary depending on your tap water... I can keep mine going for 12 months. When you start to see a spike in TDS and/or the production rate going down significantly you know it's time to change... changing before any of this happens is just a waste of money. One caveat worth keeping in mind though, which is often overlooked, is if your tap is highly chlorinated you may have to change the carbon filter more often as you will have a hard time detecting that from a spike in TDS alone. Furthermore, many 4-stage RODI system will not be able to effectively remove chloramine if at elevated levels.
Cheers,
Michael
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