Tds

[AZDesertRat]

I personally think flush kits are a waste of money and do not use them. The place you want to flush is the TDS creep from the treated side of the RO membrane, flush kits are on the waste side of the membrane and don't help that situation. If you keep up with sediment and carbon block filter replacements, and use high quality, low micron, absolute rated replacements there is really little to flush anyway. Thats something else I forgot to mention, you spent good money on the membranes so protect them so they last. Many vendors use filters about as efficient as a screen door, Spectrapure recommends a 0.5 or 0.2 micron absolute rated sediment filter and a 0.5 micron 20,000 gallon carbon block to protect the membrane. Most use 10 or maybe 5 microns nominal rated which is relatively coarse and alows particulates and colloidal materials to foul or plug the billions of tiny pores in the carbon block rendering it useless for chlorine and volatile adsorption. You can see 40 microns with the unaided human eye so you can see 5 or 10 microns is coarse versus 0.5 microns.

 

[Reefpro]

Where is the file restrictor located in the ro/di system ?

 

[AZDesertRat]

The flow restrictor is installed in or on the waste line. It can be a fixed type which I do not recommend since everyones water conditions and pressure are different so the waste flow should fit their conditions. The Spectrapures use a capillary tube type that looks like a piece of spaghetti with a flange on one end and inserts inside the waste line. You trim its length which varys the waste flow when you set your system up. If you look at any of Spectrapures Owners Manuals on their website, the links are at the bottom left side of the main page, starting on page 8 it explains how to measure the waste and adjust the restrictor. I think you might find useful information in their piggyback kit manual.

 

[Reefpro]

Update....ordered 2 90 gpd membranes new .5 carbon block, .2 sediment filter and a180gpd flow restrictor from spectra pure. I cked my TDS again after cleaning meter and I am at 0 TDS after changing resin, I'm sure this is short lived until new stuff arrives. Am I good to make 50 gallon water for water change?

 

[AZDesertRat]

Depending on the condition of the DI resin you might be. Something you can do to help would be to disconnect the second membrane and use only one so yo uare not concentrating the brine in the second one and raising the RO only TDS. The lower the TDS going into the DI, the longer it will last and the better your finished water quality will be. DI needs good contact time to do its job, if you cut the flow from 200 GPD down to 100 GPD and cut the RO only TDS from whatever it was to something lower it will give the DI a fighting chance.