a TDS of 30 on your RO/DI in my opinion would not cause your problems. Many don't use RO, even myself I don't always. I am thinking it is from one or many other factors.
What is your feeding like, maybe too much food?
Water movement, maybe not good enough?
Livestock, maybe too much, along with too much food?
There can be many factors, I personally don't think replacing your RO/DI filters will fix your problem, however it won't hurt, as you should be getting zero or near that for water export.
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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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