TDS Readings

[DeletedAccount]

We finally installed my new RO/DI unit from Walter on Friday. It is the home/reef unit. My question... How long before I get "Good" water? I have drained the holding tank for the RO water 4 times now and I am getting 46 ppm still. Mind you, that is much better than I water I have been using, I am sure, but still... I want zero. The DI part is coming out at 6 ppm. How long is the "breaking in" period?

[dan]

need to talk to old salty. he knows the ins and outs on R/Os and D/Is units

[R.Allard]

it the unit new??

[DeletedAccount]

Yes. It is new

[R.Allard]

thats probably all your going to get out of it. did you check the TDS before the unit?? it all depends on what you start out at. also if you want 0 out of your DI unit you might need to put in a valve between the RO and the DI to slow the water down going through the Di unit. the slower the water moves through the DI unit the better it works. also i installed a "whole house filter" before my Ro unit and i think that helps allot my tds coming out of my DI are arround 6 or 7
and im ready to recharge mine. you might run a couple more tank fulls through it and see if they drop if not then try the valve or installing
a prefilter.

Robert

PS if yoyu need any help give me a call 830 792 9623

[OldSalty]

Misty,
First off, What is the tds of your tap water? Second, does the unit have an adjustable flow restrictor? When you break in the unit unhook the DI and flush just thur the filters and membraine. measure the tds output from the ro side and see what its getting. You only need about 15 or 20 min flush time. Now reconnect your DI cartdige and run about 2 gallons thru it. then you can start using your DI Water. A new unit should be 0 tds. If its not it is possible your incomming water is really high in tds or your TDS meter in not calibrated correctly. Feel free to call me 558-3714 and I can explain better. :D

Kelly

[zhorne]

I also have the home/reef system from Walter. My TDS out of the faucet was 750ppm and the RO water out of the tank reads around 40-45ppm, then out of my DI cartridge, I get 0ppm.

I usually let the system drain for about 10-15 min before actually filling my containers with DI water and TDS has always been <3ppm, usually 0.

I did notice the other day that the TDS after my water softener is higher(750) than before my water softener(450). I wish some one could explain that to me. My guess would be the softener is adding Na ions, but I don't understand how it adds more Na ions than other minerals are removed.

[witecap4u]

Who's Walter?

Im looking to get a ro/di in the near future.

[Henry]

Walter is the guy from air, water and ice. web www.airwaterice.com

[OrionN]

Unhook the reservoir tank and check the TDS as it come out of the RO unit before it go into the resorvoir (you cannot completly empty the reservoir). Usually it tanke about 30 minutes for the RO membrane to flush, get all the bacterialcidal agents out of the membrane.
My TDS after RO is about 10-15. With a TDS of 40-50, your DI will not last very long.
If the RO still high check for proper placement of membrane in the housing unit. Sometime the O ring (small rubber ring at the front end of the membrane) move a little and don't have a good seal
Minh

[DeletedAccount]

Thanks everyone. Out of my faucet the TDS is near 600. It is now 0 out of DI, but still a little high out of the DI, 36. I will mess with the membrane placement tomorrow to see if that iis a problem. (Before the resorvior tank the TDS is 34.)

[OrionN]

What you have there is 88% rejection rate. A good RO membrane should have about 95%+ rejection rate.
You can:
1. Check for placement of the RO membrane.
2. Adjust the rejection ratio by decrease the resistance of the
flow restrictor in the waste water line. You should set it at
8.5-9.0 to 1.
3. Change the RO membrane

Good luck,
Minh