close the flush valve for normal operation, as well as to get a tds reading of the purified water. Make sure you let the system run for about 90 seconds before you test the tds
That carbon block is likely spec'ed at a flow of about 3.5 gpm for chlorine (not chloramine) treatment with a chlorine capacity of 12,000 gallons (meaning that after 12,000 gals it will be removing less than 50% of the chlorine). That flow is pretty slow for a whole house application but would...
There are four standard filter cartridge sizes - two lengths (10" and 20"), and two different diameters (2.5" and 4.5"). What sizes are your "whole house" filters?
This is a good point. It is easy to configure an RO system to output to both a pressurized container (like a pressure tank) and an unpressurized container (like a kettle). The water sent to an UNpressurized container will be more pure, and will be produced with much less water (concentrate)...
Assuming that's the only water in the house running (the RO), then your empty bed contact time will be fine, and with the carbon filters on your RO you'll be more than good to go.
A 10" x 54" tank with hold 1.5 cuft of media. If we provide for adequate contact time with the cat carbon, 1.5 cuft will provide for:
2 gpm with a 5 minute empty bed contact time
3.5 gpm with a 3 minute empty bed contact time.
Still a very very small tank for cgac and chloramines.
That size tank holds only 1 cuft of cgac media. If we provide for adequate contact time with the cat carbon, 1 cuft will provide for:
1.5 gpm with a 5 minute empty bed contact time
2.5 gpm with a 3 minute empty bed contact time.
If I took a guess you are running water through that tank much...