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  1. #1
    Senior Member ktown's Avatar
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    RO/DI Unit from AC

    Im am thinking about buying the RO/DI unit from Ivan. I am just not sure if the running cost would be worth it? He tells me that there is a 10:1 waste to usable ratio. Our ultilitys company in kingston chrarges for water comsumed then they charge for sewer based on water usage.

    $3.50 per cubic meter total.

    I currantly buy from a local super market. They sell it from a culligan fill your own type station. The water is DI/ ozone/ RO

    Cost is about $3.00 per 18L or 5gallons.

    Is it worth buying a RO/DI unit??? thats my Question

  2. #2
    Senior Member ktown's Avatar
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    1 cibic meter = 1 000 L
    TANK -35 Gallon with 15 gallon sump/fuge
    LIGHTS - T5HO 36" 165 total watts
    FLOW - Mag 7, fluval 304, 201 powerhead
    OTHER - seaclone 100 skimmer, RO/DI water

  3. #3
    Senior Member hippo!'s Avatar
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    Let me see, 1 us gal = .0037854 m3
    5g = .0189m3
    @10:1
    50g = .189m3
    utility cost to produce 50g is 0.189m3 * $3.5 = $0.57

    doing this quick, i think this is right.

  4. #4
    Moderator Krugar's Avatar
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    I was buying RO/DI ozone water from Loblaws & I had "whacky" water chemistry. I found their water isn't as pure as it's supposed to be & had around 30ppm Ca in it.

    Ca I can live with, but that suggests that they're not maintaining the RO/DI filter & media as much as they should. So what else snuck in?

    I ended up getting 100GpD RO/DI unit myself, but I live in Gatineau & we're not charged for water... yet. Mind you Quebec is fond of taxing us to death in general lol.

    There's been a bunch of threads on getting the most out of your RO water & what to do with the rejected water. The easiest thing I hear is to put the reject line into the washing machine & use it for a load of colds

    Cheers!
    There is nothing so permanent as a temporary measure.

  5. #5
    Senior Member ktown's Avatar
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    ~hipo~ Sorry are you saying to produce 50 gallons of clean water and wasting 500gallons would only cost .57 cents a gallon total???? now im confused:crap:
    TANK -35 Gallon with 15 gallon sump/fuge
    LIGHTS - T5HO 36" 165 total watts
    FLOW - Mag 7, fluval 304, 201 powerhead
    OTHER - seaclone 100 skimmer, RO/DI water

  6. #6
    Moderator Krugar's Avatar
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    Going through the math, hippo's suggesting that 50 gallons of water will cost you $0.57 in utilitiy charges, which will in turn make 5g of RO/DI water.

    So if the math is right (still on my first coffee I ain't checkin' it ) a 20% partial on your 35g tank will cost less than a buck.

    DI resin use is another thing but the canisters typically last a year or so. I've only had one since the fall though so that's what I recall others saying.

    Cheers!
    There is nothing so permanent as a temporary measure.

  7. #7
    Senior Member hippo!'s Avatar
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    ktown no, to produce 5 gallons of ro/di water; wasting 50g of supply water. rough calcs.

    I used 5 gallons to compare cost with store bought bottle

  8. #8
    Senior Member hippo!'s Avatar
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    little late on that one!

  9. #9
    Senior Member ktown's Avatar
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    i see thank hippo. so it looks like i would indeed save a few dollars even by wasting all that water.
    TANK -35 Gallon with 15 gallon sump/fuge
    LIGHTS - T5HO 36" 165 total watts
    FLOW - Mag 7, fluval 304, 201 powerhead
    OTHER - seaclone 100 skimmer, RO/DI water

  10. #10
    Senior Member ktown's Avatar
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    OK my math was way off!:hammerhea

    With water/and sewer we pay around .88 cents per M3 or 1000 L of water. There is a basic service charge here that i was adding in to the factor. This cost stays constant.

    So i figured that i would get about 5.5 18 L jugs for >88 cents. that to me is a big savings on the $4.00 i pay now for 1 jug. I'll just have to find a way to use the waste water.
    TANK -35 Gallon with 15 gallon sump/fuge
    LIGHTS - T5HO 36" 165 total watts
    FLOW - Mag 7, fluval 304, 201 powerhead
    OTHER - seaclone 100 skimmer, RO/DI water

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