I added the same unit to my system last year and I can't get better performance out of my unit. After the initial start up spike my TDS out of my RO levels off around 5 ppm. Meaning that my DI resin lasts forever, I'm currently 6 months in on my current resin with usage in the 1000's of gallon range, top off for a 300 gallon system with 45 gallons a week in water changes. And my built in TDS meter is verified by a hand held unit.
Prior to the booster pump I was exhausting resin in under 3 months of similar usage
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