TDS won’t go below 2

[DesertFishkeeper]

I had a 4 stage aquatics life RODI unit that was working fine and I added the upgrade water saver 2nd membrane attachment. I replaced the sediment filter and the carbon filter with new 1 micron inserts and got a new DI. I have the in line TDS meters on it and I have 2 TDS out of the membranes before the new DI and 2 TDS coming out of the DI. They are both 100GPD membranes, is that too much water going through it to filter? Do I need to switch to the triple DI with 2 single beds and 1 mixed bed? Not sure what I could be missing here.

 

[Lavey29]

Why dont you go back to what was working fine originally as you stated.

 

[Reef.]

The resin is either not compacted enough or a bad batch or you have the water bypassing the resin altogether.

 

[Joe8612]

I agree. Check the resin.

 

[DesertFishkeeper]

The resin is either not compacted enough or a bad batch or you have the water bypassing

The resin is either not compacted enough or a bad batch or you have the water bypassing the resin altogether.

I’ll try pushing it down because it is brand new and the tubes I have the testers on are on each side of the DI and I saw water going in. And fill it. That being said it filled faster than it ever has. I just assumed it was because I have 2 membranes now pushing it so much faster.

 

[Reef.]

I’ll try pushing it down because it is brand new and the tubes I have the testers on are on each side of the DI and I saw water going in. And fill it. That being said it filled faster than it ever has. I just assumed it was because I have 2 membranes now pushing it so much faster.

Well it’s definitely a issue with the resin, try emptying it and refilling, best way to compact the resin is to add maybe 4 tablespoons at a time, add some rodi water to it, this getting rid of any air bubbles, give it a bang on the counter then add another 4 tablespoons etc you need to fill it till you can’t possibly get any more resin in.

 

[DesertFishkeeper]

Well it’s definitely a issue with the resin, try emptying it and refilling, best way to compact the resin is to add maybe 4 tablespoons at a time, add some rodi water to it, this getting rid of any air bubbles, give it a bang on the counter then add another 4 tablespoons etc you need to fill it till you can’t possibly get any more resin in.

I didn’t buy bulk resin or the pouches I just ordered a pre packed container so I can’t add more. It’s this one https://a.co/d/9dnpv0Z. Is it common for these to come too loose?

 

[BryanM]

I'd revert back just to test and for sanity.

I switched to seperate anion and cation containers because usually one gets used up quite a bit faster than the other. At the rate I'm going I will replace anion 5-6x before cation is depleted.

 

[Reef.]

I didn’t buy bulk resin or the pouches I just ordered a pre packed container so I can’t add more. It’s this one https://a.co/d/9dnpv0Z. Is it common for these to come too loose?

I can’t think of anything else it could be apart from it being a bad batch of resin…if your tds after the membrane and before the resin is 2 for both membranes combined then your resin should be more than capable of taking that to zero, I would be asking for a refund and purchasing from a reputable place.

Resin can be reused when you buy it, you want virgin resin.

 

[Uncle99]

Your RO water may be “bypassing” your DI filter due to some plug. Rinse again carefully and flush out where water enters the filter, and try again.

I get this once in a while when I reload DI.

Run at least an Hour, then measure again.

 

[DesertFishkeeper]

I’ll try pushing it down because it is brand new and the tubes I have the testers on are on each side of the DI and I saw water going in. And fill it. That being said it filled faster than it ever has. I just assumed it was because I have 2 membranes now pushing it so much faster.

Just wanted to let you know you were right the container came too loose. I smacked it on the ground several times and now I’m getting 0TDS

 

[Gmorrow111]

I am getting 8 TDS going into the brand new (changed and re-packed 3 times) DI canister and getting the same after the DI filter. I used to get 0 TDS before adding the 75gpd upgrade. What are you saying exactly about something being stuck or loose?

 

[Gmorrow111]

Your RO water may be “bypassing” your DI filter due to some plug. Rinse again carefully and flush out where water enters the filter, and try again.

I get this once in a while when I reload DI.

Run at least an Hour, then measure again.

Rinse out exactly what?

 

[Uncle99]

Rinse out exactly what?

The canister, the head cap.
Just did mine, some type of deposit was plugging it