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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...

So maybe a 9" x 48" (just the tank part)?

What is the diameter and the height of your cat carbon tank? Does it have a backwashing valve on top of the tank?

These handheld TDS meters are on sale (and what you'll find in my tool box). https://www.buckeyehydro.com/tds3-handheld-meter/

The chloramine stage is a very high quality carbon block - designed to address chloramines. Any carbon filter that treats chloramines will also handle the easier-to-treat chlorine. The ASOV Kit (description is available if you scroll down on the Prem RO page) available as an option when you...

SulfATE is an anion - a softener captures divalent cations.

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Is your CGAC tank in place to deal with hydrogen sulfide (rotten egg smell)?

You'll want to feed the RO system water that has been pretreated by your CGAC tank and softener. Russ

So what you bought is called an RODI system, rather than an RO system. As Martin mentioned above, the DI resin stage after the membrane is overkill for purposes of brewing water. I'd just remove that DI stage. Your link doesn't work for me so I can't comment in more detail on your system.

What catches my eye is your high sodium and your sky high Alkalinity/Bicarb. Also - your TDS is much higher than is typical for municipal water. Your water is likely to have an off flavor/smell. As mentioned above... I think there's an RO system in your future.

The textbook answer is from membrane manufacturers, who tell you that if a membrane is not used for more than seven days it should be removed from the system and placed in a preservative. That’s not practical for most people and most people don’t do that. And the easiest thing is to just run it...

A brass brush works well... even on poly fittings/threads. https://www.homedepot.com/p/Anvil-Brass-Stripping-Brush-BB2-ANV/309996823 Russ

You definitely want to keep your ratio at 4+ to 1 and don't use a second membrane plumbed in series.

If your home water is softened, you can shoot for the a 50% recovery on your home RO as well.

Nearly all commercial RO systems (typically 500 gpd and up) are configured to run somewhere near a 50% recovery - or about a 1:1 ratio of permeate to concentrate. Recovery rates can go much higher with a recycle function (some of the concentrate is looped back to the feed side of the pressure...