Advice? should I replace Rodi filters?

i would change them out if i was you.

 

.02 isnt much imo. Theres a di on that one correct? I would just change that first

 

I would change them if they are reading 2ppm

 

Couldnt I just be the di resin? Cause when my di is used up I get readings of 2ppm. So I just replace the di

 

Those are only 50gpd so they are not gonna run very fast for good water. How old are the filters?

--- Auto-Merged, Nov 8, 2015 ---

Or when is the last time you replaced them or if you haven't how old is the unit

 

Hmm... they may need replaced then. But still 2 ppm is better then straight tap water. Try replacing just your di resin to see if that works then save up for new filters

 

2 ppm is not great but not sure why the need to buy a new RODI. Has the filter been back-flushed recently? AWI does recommend that. Replacing filters is less expensive than the entire RODI which is basically the same thing. AWI has usually been pretty good to respond to questions so you might ask them what they think. Plus they frequently give club discounts.
The tank still has to cycle so you have some time to work on the water.

 

Your RO membrane dosn't remove 100% of TDS The bulk reef supply 75Gallon/ Day membrane removes 99% so in order to tell how it is running you need to measure your incoming TDS and your outgoing TDS to determine if the membrane needs replaced. Odds are if you have 2ppm TDS your just need to replace your DI Resin. The filters before the membrane are used to help extend the life of the membrane by removing large particles from the water and chlorine which damages the membrane. Depending on how often you use your RODI you should be replacing the pre-filters once per year and the membrane like once every 5 years and the DI as needed when it turns from purple to brown. Also when measuring TDS make sure you flsuh your unit out for 5-10 minutes before taking your measurement.

RO Efficiency calculator.
TDS total dissolved solids water quality testing - TDS Meters and Testers