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what micron sediment cartridge

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  • what micron sediment cartridge

    Hi. I use a TMC V2 pure 50gpd for water production on a marine reef aquarium

    I changed my sediment filter to a 1 micron in November and fitted an extra carbon block pod with .5 cartridge.

    I have 2 DI pods and noticed my TDS was raising above 0 in a short space of time and having to change the resin quite frequent

    I have installed a new membrane and took off the .5 micron pod to do some tests. I cut open the old membrane and it was very clogged

    Im getting 80psi with the new membrane but my TDS is around 18 after the membrane

    Incoming supply is around 250.

    Question is would a 1 micron sediment foul a membrane due to reduced flow ? which micron should I be using with 250 incoming ? why am i getting 18 after membrane, is this due to 1 micron sediment ?



    All help appreciated

  • #2
    Originally posted by monkeyboy321 View Post
    Hi. I use a TMC V2 pure 50gpd for water production on a marine reef aquarium

    I changed my sediment filter to a 1 micron in November and fitted an extra carbon block pod with .5 cartridge.

    I have 2 DI pods and noticed my TDS was raising above 0 in a short space of time and having to change the resin quite frequent

    I have installed a new membrane and took off the .5 micron pod to do some tests. I cut open the old membrane and it was very clogged

    Im getting 80psi with the new membrane but my TDS is around 18 after the membrane

    Incoming supply is around 250.

    Question is would a 1 micron sediment foul a membrane due to reduced flow ? which micron should I be using with 250 incoming ? why am i getting 18 after membrane, is this due to 1 micron sediment ?



    All help appreciated

    What type of treatment do you have on the water prior to the aquarium as far as whole house stuff? DI and RO membranes don't last long on hard water or water with various other issues. It's not necessarily an issue of microns on the prefilter.

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    • #3
      No pre treatment. RO unit connected straight to mains. I collect water in 20litre containers and use for water evaporation on the aquarium.

      0 TDS is imperative for the livestock

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      • #4
        The membrane is AQUA, about £15 off eBay. They didn't state it's rejection rate in the description

        Should I try a better quality membrane ?

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        • #5
          Originally posted by monkeyboy321 View Post
          The membrane is AQUA, about £15 off eBay. They didn't state it's rejection rate in the description

          Should I try a better quality membrane ?
          I don't think the membrane is the issue so much as your incoming water quality. It's not something a filter is going to fix. Look into your water quality. Hardness, iron, etc.

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          • #6
            Thanks for your replies.

            How would I go about improving the incoming ?

            250 - 18 tds is not a good rejection rate. Shouldnt it be more like 3 or 5

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            • #7
              Originally posted by monkeyboy321 View Post
              Thanks for your replies.

              How would I go about improving the incoming ?

              250 - 18 tds is not a good rejection rate. Shouldnt it be more like 3 or 5

              That all depends on a few factors. Temperature of the water and incoming pressure are the two main ones. What type of membrane it is is another. Some types won't do better than a 90% or so rejection...like cellulose acetate. Others, I would expect a higher 90's out of like thin film composites. How long the membrane lasts depends on water quality and use. To treat the incoming water I'm talking about a water softener and whatever other equipment you might need to treat whatever conditions exist in your water supply. Hope that helps.

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              • #8
                I've checked my waste ratio and it was down to 2:1. My flow restrictor / flush valve must be faulty.

                I've opened it up a bit to get a ratio more like 4:1 and now I'm getting 12ppm after membrane.

                Going to get a decent membrane and flow restrictor I think and then try the figures again

                Comment


                • #9
                  Originally posted by monkeyboy321 View Post
                  I've checked my waste ratio and it was down to 2:1. My flow restrictor / flush valve must be faulty.

                  I've opened it up a bit to get a ratio more like 4:1 and now I'm getting 12ppm after membrane.

                  Going to get a decent membrane and flow restrictor I think and then try the figures again



                  Best of luck to you. I can tell you that for drinking water on a residential RO...12 out from 250ish going in would be perfectly acceptable. I knwo from having a saltwater tank that you want as low as possible...I just don't want you to have unrealistic expectations of what you're going to get.

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