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02/25/2018, 10:42 AM | #1 |
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RODI issues
Hello I have a maximma rodi unit. The unit is about 8 years old. Last time I used it was like 1 year ago which was working fine. I was living in the city with city water. I moved to new house that has well water. I hooked the unit up and made 40 gallons and 1 canister of DI is complete changed color. The other is about 1/4 ways turned color. It’s a 6 stage filter. 1 micron block. 2 carbon blocks. Ro membrane and 2 DI resin chambers. I bought all new filters and new membrane for it. Water coming out of the Tap is 450 tDS. Water after RO membrane is 27 tds. 0 after DI resin. Pressure coming into membrane is at 43 PSI. I do not know the co2 levels of the well water. Any suggestions or tips please
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02/25/2018, 11:55 AM | #2 |
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Membrane is trashed. Time to buy a new one.
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Quitters never lose. [QUOTE=CStrickland]Who gets mad at a starfish?[/QUOTE] Current Tank Info: 75g DT, 30G refugium, 10g chaeto tank, 50g stock tank basement sump |
02/25/2018, 12:11 PM | #3 |
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With a well you Have to de -gas the water Before running through the system or you Will kill the DI.
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps. |
02/25/2018, 12:27 PM | #4 |
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02/25/2018, 12:28 PM | #5 |
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02/25/2018, 03:50 PM | #6 |
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You should also look into getting a booster pump for the RO unit. My water is over 400 tds and my water after the membrane is 4 tds. I have a 99% rejection rate membrane. Do you know the expected rejection rate of yours or have a link to what you bought?
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02/25/2018, 04:03 PM | #7 | |
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Quote:
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02/25/2018, 07:51 PM | #8 |
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A year ago...
What’s the pressure going right into the membrane? It’s a pretty simple machine. If the pressure is good, the membrane is good and fully seated, tds should be 98% less than what went in it. The high TDS going into the DI is what is exhausting the resin. Edit: Just noticed the pressure going in was low 40s. Should be fine with that pressure. It’s the membrane.
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Quitters never lose. [QUOTE=CStrickland]Who gets mad at a starfish?[/QUOTE] Current Tank Info: 75g DT, 30G refugium, 10g chaeto tank, 50g stock tank basement sump |
02/25/2018, 08:22 PM | #9 | |
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Quote:
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02/25/2018, 08:47 PM | #10 | |
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Quote:
What membrane is it?
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Quitters never lose. [QUOTE=CStrickland]Who gets mad at a starfish?[/QUOTE] Current Tank Info: 75g DT, 30G refugium, 10g chaeto tank, 50g stock tank basement sump |
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02/25/2018, 09:02 PM | #11 |
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02/25/2018, 10:01 PM | #12 |
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02/25/2018, 10:05 PM | #13 |
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03/03/2018, 10:06 PM | #14 |
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So update actually installed a dual TDS meter before the DI its 15 tds after DI is 2. This is after I made about 60 gallons of water and 2 DI canisters. Any ideas what I should look into
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03/04/2018, 08:39 AM | #15 |
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DE-GASSING THE WATER
Sounds like the DI is shot already.
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps. |
03/04/2018, 11:49 PM | #16 |
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High CO2 will cause some issues as others have stated. There are two ways to go about it.
Put raw water in a barrel, run a large air stone, pump the water through the RODI unit with a booster pump. Or you can go through your RO system and fill a container like a rubbermaid trashcan where you degass it. Place this up high and let gravity push the RO water slowly through the DI and into another container. You have 94% rejection, which is pretty poor. Even without CO2 that high of a TDS will eat up DI so you should probably address that issue as well. Consider a booster pump and using a needle valve instead of restricter to go to 4:1 or 5:1 and see if that helps TDS post membrane.
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers. Current Tank: Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k. |
03/05/2018, 11:42 PM | #17 |
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Thanks for the tips fellas. I will install a booster pump and than give update
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