Changed ALL RO/DI filters, TDS reading is higher! WTH?

[BryanW]

I had the same issue, and then discovered that I had my DI cartrige in upside down.

 

[pledosophy]

Side note: my tap water reads in the 40s on a calibrated TDS meter... Is that possible?

Yup, mine was 17 today. I have been using DI only for a few years. Finally got a full nice RODI unit with built in TDS meters, handheld devices etc. Looks like I wasted my money. The unit is very nice though, and I shouldn't have to replace my filters often lol

 

[jiperalta]

You may also try repacking your DI cartridge. I use a piece of 1" PVC with a capped end to pack the resin into the cartridge. I recently went through the same problem and finally changed out the RO membrane and the membrane housing before I fixed the problem - burned through a lot of DI resin in the interim.

 

[Sainathraju]

How to minimize Tds

How to minimize Tds

i have replaced new membranes in my Ro plant ,now the Tds showing is quite high 170 is existing Tds . I have run the machine for around ten hours hoping the Tds will go down but in vain.can you please help me out on this.
Thanks

 

[ItzJustinN]

just posting here because i had the same problem and this is the *only* thread i could find about it.

as previously stated, these symptoms can occur when the di is placed upside down in the unit, as was the case with mine.

 

[sjet]

Old threat but I had the same problem and didn't see anyone post the solution that worked for me. So posting here for future newbies who might of made the same mistake I did. I forgot to reinstall the gasket that goes on top of the DI resin container. I thought the top screwed off, but for my container it was the bottom that screwed off so taking the top gasket off was not necessary. I forgot to reinstall it when I put everything back together.

 

[turbotank]

Having a similar problem

290 TDS Supply from house
5 TDS out of filters
25 TDS out of DI section (supply from RODI unit)

I replaced all of the filters and the TDS sensor.. Replaced all of the DI media..

Only thing different is I used Bulk Reef Supplies "purple" colored media this time...