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Dayton Water Systems’ Ultra Pure DI tanks are
identified by model and batch numbers beginning with the number 5.
These tanks are readily identifiable by red tops or the red tape at
the top of the tank. Strict guidelines and procedures are followed
to ensure the quality of the UltraPure DI tanks. Our internal
procedures go a step further to ensure that these tanks are
literally bacteria and pyrogen free.
In order to preserve the integrity of the
UltraPure tanks, the installation and distribution of them are
controlled. UltraPure tanks may not be distributed by dealers or
installed as polishing tanks to Dual Beds or Standard tanks. As
well, these tanks should not be installed in dirty industrial areas
where the possibility of contamination may occur and the ascetics
of the tank are diminished.
Mixed-bed resin is a mix of 40% strong acid
cation resin in the hydrogen form and 60% strong base Type I anion
resin in the hydroxyl form. This resin mixture produces very high
quality deionized water. Type I anion resin is very effective at
removing silica from the water.
UltraPure resin can produce high quality
deionized water, up to 18 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
UltraPure resins in the 1 and 3 Cu. Ft. vessels will produce at
least 16 meg ohm initially before exhaustion of the resin bed
begins.
Capacity of UltraPure resin is a maximum of
12,000 grains removal per Cu. Ft. High quality cut off of 200,000
ohms and above have an affect on the capacity of the deionizer
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, there is about 20% of the
resin’s capacity which will produce deionized water of
quality below 200,00ohms.
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 pluming loop it returns to the deionizers with some
sontaminants which will be removed by the deionizers.
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