RODI bypassing 1st stage di resin.

[joekidwell]

I've been making my own water for 10 years now and I've yet to see this happen.

I changed all 5 filters in January, I'm showing 3tds already 4 months later. I checked my di resins and the first stage looks brand new but the second stage has completely changed color.

How is the water bypassing the 1st stage di resin? I know it's hooked up properly the second stage gets the warer directly from the first.

It's a spectrapure 90gpd 5 stage using all spectrapure filters.

Is there supposed to be a gasket in the bottom of the canister where the cartridge meets to create a seal?

 

[Pntbll687]

Do you have the resin separated into different parts, like cation/anion/mixed bed? Or is it multiple canisters of mixed bed resin?

 

[Pntbll687]

Maybe the resin wasn't packed tight enough in the first stage, and the water is channeling through the middle of the resin. You wouldn't see any color change on the outside, but the water would get to the second cartridge.

 

[stoney7713]

Maybe the resin wasn't packed tight enough in the first stage, and the water is channeling through the middle of the resin. You wouldn't see any color change on the outside, but the water would get to the second cartridge.

Yes this happens frequently. Be sure to bang it on the counter to get it to settle several times as your filling it. At 1/4 , 1/2, 3/4 and full. It always settles and I can pack more.

 

[Troylee]

It’s most likely not packed tight enough.. just swap the 2 canisters and see if that helps..

 

[ca1ore]

Or … the rubber grommet on the top of the internal resin cartridge fell off and you didn’t notice. This happened to me once and I could not figure out why the resin was getting bypassed.

 

[joekidwell]

Do you have the resin separated into different parts, like cation/anion/mixed bed? Or is it multiple canisters of mixed bed resin?

They are the spectrapure silica buster multi layer mixed bed

 

[Opus]

First thing I would do is check the tds out of the RO and then the first DI cartridge. That way you would know if the 1st cartridge is doing anything and would also tell the condition of the RO membrane. Tap tds would also be helpful.

 

[joekidwell]

New filter I just got today on the left, first stage old filter on the right. I'm not an expert but I'm pretty sure there isn't supposed to be any voids, it's an inch or more less than full.

These filters come pre packed from spectrapure. If this happens to the new one I'll be looking to change brands.

 

[stoney7713]

New filter I just got today on the left, first stage old filter on the right. I'm not an expert but I'm pretty sure there isn't supposed to be any voids, it's an inch or more less than full.

These filters come pre packed from spectrapure. If this happens to the new one I'll be looking to change brands.

Yup not packed correctly, should be no voids. Basically crammed packed overflowing.