Quote Originally Posted by AZDesertRat View Post
You should only have a flow restrictor in the waste line, never in the treated line. Not sure what someone was thinking there? You might pull those out and check to be sure thay are not just an insert to help the plastic tubing seal and not restrictors.

If you decide to install the flush kit, which I would not personally, it has a flow restrictior built into it so remove both original restrictors in that case. The flush kit will have a restrictor in the line you show cut in tow pieces and the ball valve in the other line bypasses it when open and flow through the restrictor when closed. I wouldn't wste my time and money though and just install a correctly trimmed restrictor in the waste line to achieve a 4:1 waste ratio which is wha tactually does flush a RO membrane when in use.

Since you have two dual inline TDS meters you can install the IN probe of the first one in the incoming tap water line and the OUT probe after the sediment and carbon block filters but this doesn't tell you much since they remove TSS or suspended soldis and not TDS or dissolved solids so those readings will be withing 1 or 2 TDS of each other. The second meter can have the IN probe between the RO membrane and DI to monitor the RO TDS and the OUT probe on the final RO/DI TDS.

I have two dual inlines but honestly would sell them cheap since I neve rturn them on. My COM-100 handheld is much much more accurate and more versatile since it can read anywhere, not just a dedicated point and it is temperature compensated unlike the inlines and has a built in digital thermometer too. I look at the inlines as a litmus paper test, presence./absence, or ballpark close.

The inline pressure gauge will go between the carbon block and the RO membrane to monitor plugged filters or headloss.
Thanks again for the info! If those pieces in the waste line and treated line were not flow restrictors then this unit does not have a restrictor on it at all and that doesn't make much sense either. I got all of this stuff at no cost so i'm not too upset if some of it does not get used. If the first TDS meter would only be reading the TSS from the sediment and carbon blocks then there isn't much advantage in me installing it. I'll toss the other one in between the RO membrane and DI as you suggested but i'll use the readings as more of a ballpark suggestion on when my filters start to go. I'll have to pick up a new handheld TDS meter and run a few tests. I think i'll put a better restrictor in the waste line and remove the two that are in the unit currently. that will likely help with my overall water production as well I would think.

Presently this unit is rated for 50gpd, do you see any advantages / disadvantages to me replacing the RO membrane & flow restrictor to 75gpd?