RODI Filters

JonnyTorch

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Hey all. After a long while I decided to use my own RODI system and mix my own salt so I don't have to go to the LFS every week.

My RODI is pretty new, (I've had it for a couple years, but never used it) and a TDS meter reading out as 0.

I've googled this, and can't seem to find a precise answer anywhere..

If I have a TDS meter and my RODI starts to say 1, 2 or 3 with the TDS meter, how do I know if I need to change out individual filters, just the DI resin, just the membrane or all? How to know what component is making the numbers rise?

Thanks! (This is preemptive - I just want to know for when it does rise.)
 

208reef

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These are the instructions given with SpectraPure RO/DI systems. Might be different for other manufacturers.

Micron filter - Change every 4-6 months or once you see a 15% PSI drop from normal on the pressure gauge
Carbon filter - Change every 4-6 months or once you detect 0.1ppm total chlorine from the product water using a test kit (total chlorine, not free chlorine)
DI resin - Change once TDS >1

They don't offer any info in their manual about how often to change the RO membrane and someone may have a more scientifically accurate answer, but if I am remembering correctly I believe most people replace them every 1-2 years.
 
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JonnyTorch

JonnyTorch

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These are the instructions given with SpectraPure RO/DI systems. Might be different for other manufacturers.

Micron filter - Change every 4-6 months or once you see a 15% PSI drop from normal on the pressure gauge
Carbon filter - Change every 4-6 months or once you detect 0.1ppm total chlorine from the product water using a test kit (total chlorine, not free chlorine)
DI resin - Change once TDS >1

They don't offer any info in their manual about how often to change the RO membrane and someone may have a more scientifically accurate answer, but if I am remembering correctly I believe most people replace them every 1-2 years.
Alright. thank you. that's pretty precise. I appreciate it. Mine is the BRS 4 stage, like the image pictured, so no pressure gauges visible. I'll have to figure it out.. Mine has been sitting on the shelf for 2 years unused, I've maybe used 20 gallons out of it total so far, but hooked it up and it's still saying 0 TDS, so I'm good for NOW. If I continue to use this regularly I imagine next year get a membrane and when the TDS gets above 1 I can just change the carbon and the DI resin together. Idk, still figuring it out! This was actually a gift to me. Thank you.
brs-exb-210772-rodisystems-fr_1.jpg
 

KStatefan

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To determine the condition of the membrane monitor the rejection rate of the membrane. To do this you need to know the TDS of the water before and after the membrane.
 

Buckeye Hydro

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You'll want to add a pressure gauge add on kit - without it (and a TDS meter) you are flying blind.

When it does come time for a filter change, you may want to upgrade to a 1 micron sediment filter and a 0.5 mic carbon block
 
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