RO DI system question

imdaring

love my reef
how do I know or how often should I replace my filters I have a 6 stage tankless RO/DI system and were is a good place to get them
 
The TDS meter? Or the membranes? The membranes, I assume. It depends on your preference. Some people (like me) think that anything below 20 is doable. Other people wouldn't let their TDS get above 5.
 
That's actually good to know, Biff. Mine's starting to occassionally go to 1, and I always wondered what number is too high.
 
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