Reverse Osmosis TDS Question

[Cibo]

What is a good reading TDS reading I want to make sure my ro unit is working it was working slow i took off stage 1 2 3 and washed them off the presure came back I am getting a reading of 25 on the TDS how high is bad
:Thinking:

 

[andylee]

Just running the RO, I get between 2 and 4. When I pass the water through the DI portion, I get 0. Tapwater where I am is in the 40s, so I would think that something's not working properly in your system.

 

[Cibo]

mine goes throught a di I how long do the filters last i have mine 8 months? dont use it much just water changes and top off i have a 24 gal reef.....

 

[Tim]

Do you let your unit run before you take your readings? Try running it for five min. or so than take your readings and see if they are any better. You have to get the water that is traped in the system out and the new water through to test it. Hope this helps. I just changed my filters and have readings of 0-1,with my unfiltered tap reading about 420.....

 

[andylee]

What if you don't run it through the DI? Could the DI unit be saturated and leaching stuff back into your water?

 

[masterswimmer]

I change my filters as soon as my reading goes from zero to one.
If you're running your tap through RO/DI it should exit at zero.

Tim is absolutely right. Before I let any of my processed water go into my collection tub, I flush the filters for about 5 - 10 minutes. After that I still don't collect any water until the reading comes down to zero. Works great for me. Others might accept higher readings, I don't.

swimmer

 

[Cibo]

what types or reading do you get from tap water

 

[masterswimmer]

what types or reading do you get from tap water

My tap registers 105 ppm. I've seen people with tap as high as 900 ppm. :bigeyes2:

swimmer

 

[PalmTree]

I get a reading of about 2 or 3 after it goes through the RODI. With out the filter I get a rading of about 37 to 40. I had no idea it was possible to go as low as 0. 900 is just insane!! :bigeyes2:

 

[masterswimmer]

The person who started out with 900 got it down to zero after his RO/DI.
Starting below 40 like you are, shouldn't even tax your system. Should be very easy to get yours to zero.

swimmer

 

[PalmTree]

Interesting. I wonder if there is anything I can do to get it down to zero. My RODI is almost new running for about a week at most. I did all that was asked of me in terms of flushing the system and tossing the first 5 gallons.