Quote:
Originally Posted by mike31154
I mainly keep track of water changes & RODI system throughput. I don't like changing filters on a calendar basis, since that has nothing to do with how clogged they get. It's all about how much water you've sent through it and what the TDS out of the RO membrane is. Also, it's good to know when you're getting close to the 20,000 gallon mark through your carbon filter, if it's rated for that, rather than changing at an arbitrary 6 month interval. I've found the less I mess with the RODI, the better it works. Change the sediment filters regularly, but I'm still on the original 75 gpd membrane and only the second carbon block in over 5 years.
Although my spreadsheet has a page for all the chemical parameters, I don't typically check those very often, unless the tank "doesn't look right". But since I've gone to the trouble of maintaining a spreadsheet, it might as well be able to track that stuff. I don't print any of the info to put in a binder. Don't see the need when I can see it all on the 'puter.
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You should really change your carbon block more often, most of them are rated for 20k gallons at 50% efficiency or so, which means that by that time, they are letting 50% of what they should be stopping through. Plus that rating is for continuous operation, so if it sits for some time it will reduce the number somewhat. Plus there's clogging of the micron filter before the block (will happen to some degree even with a sediment filter of equal micron size before it), bacterial growth etc. And it's a 9 dollar part.
BRS has a great series of videos on carbon blocks and rodi systems, a true wealth of information. Myself, I change my sediment filter when water pressure drops from 60 psi to 50 psi, and the carbon filter every second time I change the sediment filter. Probably works out to every 1000 gallons for the sediment, and 2000 for the carbon