Very likely your RO membrane is shot.
Your best way to test this is to measure the TDS of the water at these points:
- before everything
- before the RO
- after the RO
- after the RO (waste water)
- after the DI
Ideally the water after the RO should be close to zero. We have similar water (I'm in Edmonton), and my pre-RO TDS ranges from 170 - 210, and my post-RO/pre-DI TDS ranges from 0 - 2. If you have higher pre-DI TDS, then your DI media will be used up very quickly.
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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