Yamato Scientific WG221S Water Purifiers - Manual (Page 41)

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Maintenance
Check and maintenance
Time for periodical check and maintenance (Check periodically the unit to use in stable
condition.)
Item to check and maintain Period Note
Exchange of pre-treatment cartridge
Each 6 or 12
months
Durability:
About 5000 in case of using water service
in Tokyo (with quality of 200×10
-4 S/m)
You need earlier exchange of the cartridge
when you use raw water with worse quality.
Exchange of ion-exchange resin cartridge
When the
indicator (1)
shows Durability:
About 650 of raw water with quality of
200×10
-4 S/m
Cleaning the still 3 months
Cleaning the water supply hose filter 6 months
You need earlier cleaning when you use raw
water with worse quality.
Hose exchange 2 years Check the joint once a month.
Distilled water tank 3 months
Exchange of Pre-Treatment Cartridge
Refer to Page 15 “Connect securely the pre-treatment cartridge” in the “Safety Precaution”.
Dispose of the old pre-treatment cartridge as nonflammable.
If you use the unit without changing the pre-treatment cartridge, the span of life of the ion-exchange resin
cartridge is made short.
Exchange of Ion Exchange Resin Cartridge
Because the keeping of the cartridge for long time makes the water quality and durability worse, prepare
the spare cartridge for the time to exchange. The standard of keeping in about four months.
Refer to Page 14 “Connect securely ion-exchange resin cartridge” in the “Safety Precaution”.
Dispose of the exchanged cartridge as nonflammable.
If you use the unit without changing the cartridge, stone attaches increasingly to the inside of the boiler
and heaters, which can decrease collection of distilled water and damage heaters.