Deionised water

Discussion in 'Water Parameters and Additives' started by nakoma, 15 Apr 2010.

  1. nakoma

    nakoma

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    Does anyone use deionised water to replace evaporated water instead of using R.O water ?????
     
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  3. poiromaniax

    poiromaniax MASA Contributor

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    My RO unit has a DI resin on it. (I think all of the Waterboy units do)
     
  4. nakoma

    nakoma Thread Starter

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    Deionized water is a type of purified water with mineral ions (salts) removed. These mineral ions include sodium, calcium, iron, copper, chloride, and bromide. Deionized water is created by taking conventional water and exposing it to electrically charged resins that attract and bind to the salts, removing them from the water. Because most of the impurities in water are mineral salts, deionized water is mostly pure, but it does still contain numerous bacteria and viruses, which have no charge and therefore are not attracted to the electrified resins.
    In recent years, many deionization systems have been marketed for home use, often with claims that deionized water is an antioxidant that can slow aging and prevent disease. This is quack medicine, and contradicts basic aspects of physiology and chemistry. Some scientists who have studied the health effects of deionized water have even called it "snake oil on tap." There are many reasons why deionized water should not be expected to give positive health effects, but one is that the mineral salts that one would avoid by drinking this water are merely regained by eating any other food with even trace amounts of moisture. So the level of mineral salts in the body is essentially the same either way. Many of the mineral salts are essential nutrients, and some scientists even say that drinking unpurified water provides us with significant portions of our daily values of these nutrients.
    Despite its uselessness for improving health, deionized water has many applications, most of them scientific or industrial. Deionized water is used extensively in microbiology experiments as a medium. This deionized water is also cooked in an autoclave prior to use, which kills off all bacteria or viruses therein. It is used to top up lead acid batteries used in cars and trucks, as mineral ions found in tap water drastically reduce their lifespan. It is used for steam irons used on clothing, ensuring well-ironed clothes without any chance of mineral residue. Deionized water is also used as a medium or additive in many pharmaceutical or cosmetic products, desired for its low chemical reactivity
     
  5. nakoma

    nakoma Thread Starter

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    the deioniser i have takes everything out it is so clean that is not safe for drinking
     
  6. Midasblenny

    Midasblenny

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    RO does that as well.
     
  7. nakoma

    nakoma Thread Starter

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    yes i know i am not saying one is better than the other or trying to prove something what i want to know is if anyone is using deionisors not ro unitis
     
  8. poiromaniax

    poiromaniax MASA Contributor

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    My unit is RO and DI. You should not drink the water that comes out of it.

    First water passes through the RO and then that water goes through DeIonizing resin.
     
  9. nakoma

    nakoma Thread Starter

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    [FONT=arial,helvetica]RO, DI, and Distilled Water
    Evaporation can be made up with distilled, deionized (DI), or
    reverse osmosis (RO) water. Distilled water has no salts or
    nutrients, but does pick up atmospheric carbon dioxide during
    condensation. Stills are laboratory instruments far too expensive
    for aquarists. You can buy distilled water at supermarkets for
    about a dollar a gallon. Tap water is usually unsuitable for make-
    up water because its dissolved chemicals will alter the chemistry
    of the aquarium over time, its nutrients may promote growth of
    noxious algae, and municipal additives (chlorine, chloramine) may
    require the addition of even more chemicals such as sodium
    thiosulfate for neutralization.
    Differences between DI and RO
    Commercial DI and RO units for the aquarium hobby produce good
    water at a reasonable cost. Both require maintenance. RO membranes
    must be replaced when flow rates drop. Deionizer units must be
    recharged or have their cartridges replaced. RO water takes many
    hours to produce in multi-gallon quantities, whereas running tap
    through a DI unit will produce all the water you need in a short
    time. RO units waste 75 percent or more of the water coming through
    the unit, while deionziers waste none. RO units are expensive to
    operate if your water/sewer service charges are based on water use.
    RO units must be run for long periods, and accidental flooding due
    to failure to turn off the unit is quite common. Both RO and DI
    product water ideally should be tested with a total dissolved
    solids meter to monitor effectiveness, but a hardness kit is a good
    substitute.
    The combination of DI and RO units in series produces
    excellent quality water, provides backup in case one unit fails,
    and increases the lifetime of the resins and the membranes. It may
    be worth the cost in parts of the country with very hard water, or
    where house plumbing contains lead pipes or copper pipes with lead
    solder. Where lead in tap water is high due to plumbing, let the
    tap run ten minutes before taking water for drinking or aquarium
    use. The effectiveness of an RO or DI unit can be increased by
    combining it with a mechanical prefilter and activated carbon
    adsorption filter. The best quality water combines all of the above
    in the treatment train.

    Deionized Water
    Deionization removes non-ionic gases, and is purer than
    distilled water. A deionizer canister contains charged synthetic
    resin beads or granules that attract ions of opposite charge. Newer
    units use synthetic resins with differing attractiveness for
    calcium and magnesium and for the anions nitrate and phosphate (NO3-
    , PO4---). Units in series remove a broad spectrum of charged
    chemicals. Deionizers require replacement of the resins or recharge
    in a laboratory with strong acids or bases. As with distilled
    water, you can purchase DI water

    Reverse Osmosis
    Reverse osmosis removes a high percentage (not all) of
    minerals, nitrates, and phosphates, but not silicates. Tap water is
    forced through a semipermeable membrane using the pressure provided
    at the tap. Tap water is under pressure sufficient to squeeze the
    water through the membrane while not allowing passage of minerals
    and salts. An RO unit requires several hours of breaking in, but
    afterward might produce 25 percent by volume of oxygen depleted,
    cation-poor and anion-poor water and 75 percent by volume
    wastewater containing 85-95 percent of the ions and other
    impurities of the tap water.
    RO efficiency depends on the impurity of incoming water, water
    pressure, water temperature (room temperature is better than cold
    or hot water), and the type and age of the semipermeable membrane.
    Cellulose triacetate (CTA) membranes are readily degraded by
    bacteria, and must be used in chlorinated water or they will break
    down. More expensive thin film composite (TFC) membranes are
    damaged by chlorine but work better on nitrates, yet in most areas
    nitrates are not a problem. Vendors will advise you on the type
    (CTA, TFC) and size unit (gallons/day) for your applications. All
    membranes have limited life expectancy, so product water should be
    tested every couple of months with an expensive total dissolved
    solids (TDS) meter or an inexpensive marine hardness test kit.
    You can divert RO product water and wastewater to remote
    locations in your fish room with tubing and connectors from a
    hardware or appliance store stocking parts for refrigerator
    icemakers.
    [/FONT]
     
  10. nakoma

    nakoma Thread Starter

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    wow nice my unit is actually in part of our lab and we use it for chemical analises so it is not comercialy sold
     
  11. poiromaniax

    poiromaniax MASA Contributor

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  12. nakoma

    nakoma Thread Starter

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    i dont have a R/o unit just the Deionizor is it ok if i use the water from that or is it better to let it run through a R/o unit as well
     
  13. poiromaniax

    poiromaniax MASA Contributor

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    I would say its much better as RO removes minerals, nitrates and phosphates and DI doesnt.
     
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