RODI Issues

[7FootReefer]

I bought a secondhand 5stage rodi unit the other day, It is from a local company that went out of business. I hooked everything up and had tons of waste water and minimal amounts of clean filtered water. (Approximately 1 quart filtered, 5 gallons waste) I thought it might have been the filter because they were old and worn out. So I replaced all the filters, but I am still getting the same results as before. The unit has three 4" diameter filters that are about 11" in length and it has two smaller filters on top. Does anyone know what I am doing wrong?

 

[11purewater]

did you replace the membrane?and the inline filter after the membrane is redundant,remove it.

 

[7FootReefer]

I replaced all 5 filters. Here is the list of the filters I was given:

Kx CTO
GAC
5 Micron Melt Brown
Alcro
50 GPD Filmtec Membrane

 

[7FootReefer]

I removed the in-line filter and am still experiencing the same issues.

 

[redfishbluefish]

I apologize in advance, but is the water flowing in the right direction. Incoming “dirty” water should be entering that first lower canister on the right (with the “X,” and markings on it), and exiting “clean” on the upper left.

The filters should be first to last, a sediment filter, a carbon block, a second carbon block, the membrane (and in your case, which you’ve taken off line, a polishing carbon filter).

 

[7FootReefer]

Never mind I have found the problem, The previous owner switched the output elbows on the membrane canister so I had nothing restricting the waste output, but was actually restricting the filtered water output. I switched the elbows and it works flawlessly, thanks for the help

 

[AZDesertRat]

You should be getting close to 4:1, waste to treated.
I would reconsider the filter choices you were given and at least eliminate the GAC as the carbon dust or fines they produce will foul whatever is downstream of it. My preferred filter arrangements are either a 0.5 or 1.0 micron absolute rated sediment filter, a single 0.5 or 1.0 micron KX +1 carbon block, the RO membrane and a final full size vertical DI filter for reef use.

In the photos, is that a horizontal DI on top or a GAC taste and odor drinking water filter? If it is GAC you will not want nor need it for reef use. If it is a DI, you can easily and cheaply convert the extra empty 10" vertical canister to a full size refillable DI in about 15 minutes and for less than $10 and have much better water quality, longer DI life and lower operating cost overall.