350 PPM TDS before RO, 10 PPM after RO, 0 PPM after DI - Chewing through Resin

[Chocobo]

 

[earwicker7]

OP, have you researched "TDS creep" ? Basically, the RO water produced at start up can be very high in TDS & then drops off as more RO water is produced. If this initial water is going into your DI resin, it will exhaust the resin faster. An in-line TDS meter on the output RO line will show you when it is ok to then divert to the DI resin. Please ignore if you are already aware of this HTH

This.

If you use an auto top off which pulls straight from your RO/DI (as opposed to a reservoir), each time it starts you are going to get high TDS going into the DI resin.

I was going through huge amounts until I programmed my Apex controller to only turn the auto top off on
for fifteen minutes every six hours.

 

[Chocobo]

This.

If you use an auto top off which pulls straight from your RO/DI (as opposed to a reservoir), each time it starts you are going to get high TDS going into the DI resin.

I was going through huge amounts until I programmed my Apex controller to only turn the auto top off on
for fifteen minutes every six hours.

I am not using an ATO from the RO system. I am using a 55 Gallon Drum that I fill and then turn off the RO system until that drum is empty - and I am flushing the permeate to the drain until the TDS drops down to ~7 PPM. I can visibly see the mixed bed resin color changing as I make 55 gallons - I use about half a cartridge making a single barrel.

I have since, as per my last update, switched to cation, anion, and then mixed.

 

[earwicker7]

I am not using an ATO from the RO system. I am using a 55 Gallon Drum that I fill and then turn off the RO system until that drum is empty - and I am flushing the permeate to the drain until the TDS drops down to ~7 PPM. I can visibly see the mixed bed resin color changing as I make 55 gallons - I use about half a cartridge making a single barrel.

I have since, as per my last update, switched to cation, anion, and then mixed.

Half a barrel is a lot.

 

[Chocobo]

Half a barrel is a lot.

I got 1,000+ gallons out of a single mixed bed cartridge at my old place on the same water company...

 

[earwicker7]

I got 1,000+ gallons out of a single mixed bed cartridge at my old place on the same water company...

Meant to say half a cartridge is a lot... d'oh!

 

[Chocobo]

Meant to say half a cartridge is a lot... d'oh!

.