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Old 03-25-2014, 12:16 AM   #1
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How often do I change rodi filters?

I'm about to start a saltwater tank and I'm going to by an rodi unit. How often do I need to change the membrane and the filters and the deion unit. I know that you should change it when the TSS level passes one but how long does that generally take? I would do a 7 gallon water change a week for a 45 gallon tank. So how long will it take before I change the things.
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Old 03-25-2014, 12:17 AM   #2
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I mean TDS not tss
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Old 03-25-2014, 03:13 AM   #3
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It depends on the kind of ro/di unit some have flush valves that can increase the life of them. Agter about 8 or 9 months my Tds meter read more than 0. I make roughly anywhere from 15 to 45 gallons a week depending on water changes and top off water.
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Old 03-25-2014, 07:43 AM   #4
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I change my sediment about monthly, and my carbon about every 2. A R.O. membrane should last you about a year under regular use. I make about 75 gallons a week. it also depends on your water. If your water is poor, you'll be catching a lot more junk than others. My water is terrible.
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Old 03-25-2014, 09:28 AM   #5
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Okay, my water is pretty clean. I guess all the stuff inside of mine will last long. Thank you!
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Old 03-26-2014, 04:26 PM   #6
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When is a good time to change your filters? I can tell you I didn't think the RO/DI units make a BIG difference with a TDS reading, but they do. My normal well water is 315TDS, and when it's passed though my Filter it reads 007TDS.

At what number should you start to worry about changing the filters and cleaning out the membrane?
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Old 03-26-2014, 08:05 PM   #7
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I would change mine out long before I got to 7 actually. 4ppm would be enough for me to change out my DI resin.
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Old 03-26-2014, 11:54 PM   #8
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Thanks Mr_X! I will be changing them. I don't know how long the DI Resin should last. I this unit.

Amazon.com: Coralife 05692 Pure-Flo II 50-Gallon Per Day 4 Stage RO/DI System: Pet Supplies

How long will a deionization cartridge last? The ones I see are in the $30's and some say they only last a week. That's expensive! I do have well water and it's very bad water with a reading of 315! Will replacing just the first two filters be fine? How often do I need to change the deionization cartridge?

Is there a good refillable one that fits my system?
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Old 03-28-2014, 08:58 AM   #9
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Get the color changing DI resin from BRS. They sell it in bulk,

BRS Bulk Deionization Resin - Color Changing - Bulk Reef Supply


as well as a refillable cartridge which will fit in your 10" canister-
Clear Refillable Cartridge for DI Resin - Bulk Reef Supply


And the canisters if you don't have one available-
Reverse Osmosis Canisters - Bulk Reef Supply
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Old 03-28-2014, 09:59 PM   #10
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Thanks Mr_X!!
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