RO water problems

[Myka]

You don't have an RO membrane? DI resin wears out real quick without an RO prefiltering the water for you. A tap water TDS of 195 is moderate. I don't see the need to run dual sediment filters. The dual carbon isn't such a bad choice though. Add an RO membrane before the DI and you should be good for quite some time (albeit you DO have a freakin 250 gallon tank!!).