The guy at Big Al's told me this as well. Convinced me to go DI only.
I wish I had a TDS meter.
My eyeball meter says my hair algae is gone.
I don't have any issues with my tank water.
Corals look happy.
And my DI resin is about 1/4 expired.
I bought the unit in Oct last year and would guess I've made over 200g of water so far.
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