I just had to change mine after only 3 months. I think it went faster the second go around because when I ordered the kit I think I asked for a 5 micron instead of a 1 micron pre filter, also I don't know if I packed the DI resin in enough on the 1st change cause it started to discolor at the chamber entrance only after 15 gal. So I packed the 2nd change with more & used a 1 micron replacement it seems to still be original color/blue after the 1st 25 gal.
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