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
https://www.bulkreefsupply.com/single-deionization-canister-with-dm-1-dual-tds-meter.htmlor something like it from someone else

kilnakorr · Mar 19, 2021

lapin said:
Get the add on di kit from BRS
https://www.bulkreefsupply.com/single-deionization-canister-with-dm-1-dual-tds-meter.htmlor 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

https://www.ebay.co.uk/sch/waterman-123/m.html?_nkw=&_armrs=1&_ipg=&_from=

kilnakorr · Mar 19, 2021

lapin said:
https://www.ebay.co.uk/sch/waterman-123/m.html?_nkw=&_armrs=1&_ipg=&_from=

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.