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Dayton
Water Systems’ Standard DI tanks are identified by model
and batch numbers beginning with the number 4. These tanks are
readily identifiable by blue tanks or the blue tape at the top of
the tank.
Standard resin is a mix of 40% strong acid
cation resin in the hydrogen form and 60% strong base Type II
anion resin in the hydroxyl form. This resin mixture produces a
high quality of deionized water. However, Type II resin is not as
effective as Type I at removing silica from the influent water
supply. Silica can be problematic in metal or automotive body
painting applications.
Standard resin can produce high quality
deionized water, up to 16 meg ohm, depending upon certain
conditions. These conditions include flow rate, feed water
quality, the system set up, condition of the resin, and the
amount of time the system sets idle. We guarantee Standard resins
in the 1 and 3 Cu. Ft. vessels will produce at least 5 meg ohm
initially before exhaustion of the resin bed begins.
Capacity of Standard resin is a maximum of
12,000 grains removal per Cu. Fu. High quality cut off of 200,000
ohms and above has an affect on the capacity of the DI exchange
tank. Generally, we reduce the capacity by approximately 20% or
10,000 grains removal per Cu. Ft. when the quality cut-off is
200K and above. As resin begins to exhaust, the quality gradually
declines. For this reason, about 20% of the resin’s
capacity which will produce deionized water of quality below
200,000ohms.
Recirculating systems will also have an affect
on the capacity of the exchange tank. A recirculating system is
set up to maintain high quality process waters. Water enters the
recirculating loop from a RO system or even a raw water supply.
The loop contains DI exchange tanks and a recirculating pump to
continually pump water through the loop. As the water
recirculates through a plumbing loop it returns to the deionizers
with some contaminants which will be removed by the deionizers.
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