TDS Issue

[ReefJeff]

Another TDS Issue
Hello friends,

I recently changed all the filters and 150 gpd membrane in my 5 stage RO unit (no DI) (2 year old unit kept very clean) not to mention all the lines. My problem is my TDS after only 5 months on a new membrane and filters went up to 47. Now after changing everything out my TDS is still very high at 35. This was tested with In-Line TDS meter and I have 2 Hanna TDS meters. All meters were within 2 points, so average of the 3 different meters is 35 TDS.

The filters and membrane were recommended through Big Al's supplies.

I do not have a pump on here as my water pressure gauge (in-line) reads about 52 psi. Even my ph is as high as 7.3. When this unit was new, ph was 6.6/6.8 max.

Any ideas friends on how to obtain "0" TDS again other than buying a new unit?

Thank you,

Jeff

 

[eww]

What is your TDS going into the unit?

Sent from my DROID RAZR using Tapatalk 2

 

[NanaReefer]

Start using DI resin

 

[ReefJeff]

Thank you for all the information.

Here is my system I bought 2 years ago.

http://www.ebay.com/itm/5-Stage-Drin...item2c57be241c

It came with a 1 micron and 5 micron filter. My tap TDS range is 260/270 at 55/58 degrees. The rejection rate is about 4 to 1.

Here is the membrane I purchased.

Amazon.com: AquaFX TFC Membrane - 150 GPD: Pet Supplies

I know I will never get to zero but 35 with all new filters and membrane is quite high.

Thank you for the information. I am sorry I did not get all this info in my first post.

Jeff

 

[NanaReefer]

I only know that when I start to see TDS readings of an number. It's time to change my resin.

 

[Scooterman]

If your coming in from city water the TDS range can change on you, wich would in turn increas your TDS output, with a good RO memberane like the DOW membrains will remove 98% but adding a DI to your system would bring it down to "0".
You need to check the % on your new membrane it could be that is normal for that brand.