I bought one of those as well, as I couldn't afford a RO/DI unit as well.
The cost of the TAP water Purifier, was cheaper then buying purified water in 5gal buckets.
I've been using the same purifier since I bought it (dec), in my 38g tank. I've done 2 full tank water changes, and have no problem so far.
I'm actually just looking up when I should be changing the filter in mine, I suspect every 3-4 months, but I guess it comes down to how often it gets used.
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