View Full Version : what should i re-replace on my typhoon III?

12/15/2008, 12:47 PM
My Typhoon III is about 2 years old
I replaced the 3 stages and the DI in April 2008.
The TDS is rising again

tap 156
RO 25
RO/DI 10

which one should I replace? Or more than one?

its likely due to the plumbing work that was done this summer, extra junk was coming into the pipes due to the increased flow and pressure

12/19/2008, 01:00 PM
Replace the bottom 4. With the numbers you provided it sounds like the DI chamber is almost used up. When my TDS on the RO side start to creep up, I place the order and get them in before it gets too high.

12/25/2008, 10:12 AM
Based on the input TDS, you should be seeing 8 TDS or less after the membrane if you have a 75GPD membrane and 16 TDS or less is you have 100GPD membrane. Looks like your RO membrane is shot. Replacing the DI resin will get you back to 0 TDS for the DI output but the resin will wear out quickly. I'd recommend a new membrane.

01/04/2009, 04:50 PM
So a 100gpd membrane produces a higher tds water than a 75gpd menbrane?

01/04/2009, 07:36 PM
If its a TFC/GE model yes.