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02/16/2018, 07:00 AM | #1 |
Registered Member
Join Date: Dec 2006
Location: Canada
Posts: 3
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high TDS after running RODI backwards
Hi guys.. wondering if anyone can point me in the right direction here. I have a spectrapure CSPDI 90GPD.
One sleepy morning I switched the outlet to the inlet tubes and ran the RODI flow backwards into the DI resin. I heard a "pop" and when I switched it back the TDS reads about 60-80 constantly after a few hours of running when it used to read 2-3 coming out of the RO membrane. I took the whole unit apart and put it back together but can't tell what's broken. I'm guessing its the RO membrane since the rejection rate is so low now. Hoping someone has any advice before I purchase a new RO membrane. Thanks! |
02/16/2018, 07:51 AM | #2 |
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Join Date: Oct 2007
Posts: 26
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I would call/email Spectrapure directly. They are very knowledgeable and helpful. I’ve asked them questions many times.
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02/16/2018, 11:48 AM | #3 |
Registered Member
Join Date: Jul 2005
Location: North Texas
Posts: 605
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I wonder if it messed up your flow restrictor? What is your current waste to good water ratio? Should be around 4 to 1.
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02/16/2018, 02:28 PM | #4 |
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Join Date: Jan 2006
Location: Glenn Dale, MD
Posts: 1,613
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Reads like there is a hole in the membrane.
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No man is an island entire of itself; any man's death diminishes me, because I am involved in mankind; never send to know for whom the bell tolls; it tolls for thee. John Donne Current Tank Info: 120g Reef 100g Rubbermaid Sump, 20g Refugium; previous tank: 46g Drilled; Self Plumbed, Birds Nest, Anchor, Xenia, Zoas, Yuma Yuma Ricordea, Chalice, Mushrooms, Brain, Acan, Anenome Plate; Clams, Other Inverts, Fish, Live Rock |
02/18/2018, 12:17 PM | #5 |
Registered Member
Join Date: Dec 2006
Location: Canada
Posts: 3
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Thanks for the responses. I contacted spectrapure and they said I need to replace the RO membrane.
I thought it was the flow restrictor too but I am getting 4:1 ratio range. Will update this thread if that fixes it in case anyone else runs into this issue. |
02/18/2018, 01:17 PM | #6 |
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Join Date: Jan 2006
Location: Westminster, CO
Posts: 17,289
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Replace the membrane with a 99% from Spectrapure. Consider it an upgrade.
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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. |
02/20/2018, 08:24 PM | #7 |
Registered Member
Join Date: Dec 2006
Location: Canada
Posts: 3
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The membrane was the issue. Running the unit backwards was costly!
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02/21/2018, 06:09 PM | #8 |
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Join Date: Nov 2002
Location: Miller Place, NY
Posts: 7,206
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And HOT water is another NO-NO.
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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. |
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