DI filter size?

kilnakorr · Mar 18, 2021

I'm thinking of adding a DI filter to my RO unit.
Currently producing TDS of 2 water.
We don't have dangerous stuff or additives in the water here, but removing the remaining 2 TDS (whatever it is) seems like an easy task.

Question is, how big a unit/filter should I get?

I make about 100 L / 26 gl a week of RO water.
I want one big enough to not need to change it too often.

Recommended size anyone?

lapin · Mar 18, 2021

Get the add on di kit from BRS

Single Deionization Canister with DM-1 Dual TDS Meter

Single deionization add on canister kit complete with Dual TDS Meter and pre-packed color changing DI cartridges! Dimensions - 14" x 6" x 5.5" Dual TDS Meter already installed Perfect for adding additional DI stages to your RO system Cartridges come with canisters full of Color Changing DI...

www.bulkreefsupply.com

or something like it from someone else

kilnakorr · Mar 19, 2021

lapin said:
Get the add on di kit from BRS

Single Deionization Canister with DM-1 Dual TDS Meter

Single deionization add on canister kit complete with Dual TDS Meter and pre-packed color changing DI cartridges! Dimensions - 14" x 6" x 5.5" Dual TDS Meter already installed Perfect for adding additional DI stages to your RO system Cartridges come with canisters full of Color Changing DI...

www.bulkreefsupply.com

or something like it from someone else

BRS isn't an option.
I found a 10"×4,5" and 20"×4,5". Sadly the bigger one is reinforced with brass, so can't use that.
I just don't want to need to change resin every month.

lapin · Mar 19, 2021

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kilnakorr · Mar 19, 2021

lapin said:
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Shop eBay for great deals from waterman-123!

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This doesn't help, but thanks.
I guess I should rephrase my question.
How many gallons of water can I make before say 2lbs of resin needs to be changed?

Jekyl · Mar 19, 2021

The larger the filter the less it needs to be changed. I can make over 150 gallons before changing resin with the BRS one. Adding a booster pump may also increase that number.

kilnakorr · Mar 19, 2021

Jekyl said:
The larger the filter the less it needs to be changed. I can make over 150 gallons before changing resin with the BRS one. Adding a booster pump may also increase that number.

That would last me roughly 6 weeks, so I think I need af larger one. Thanks for the numbers!

lapin · Mar 20, 2021

I have a 3 resin stages. I have not changed them in over 6 months. Incomming TDS is 17 to 25

Mical · Mar 20, 2021

I too have 3 stages of DI resin(s) Cation, Anion and dual bed resin. Our tap water runs 280 to almost 420 depending on the season (In rural Minnesota) after my membranes it's 4 and after resins it's 0. I change out Anion every 3-4 months and the Cation and dual bed has gone over a year.