Regal 53 SC Owner's Manual page 369

VACUUM STYLE HEAD SYSTEMS
The vacuum (suction) system requires periodic cleaning
for maximum sanitation and operational effi ciency. Use a
bowl cleaner such as Bon Ami® which will not abrade the
toilet bowl lining. Do not use chlorine solvents or caustic
chemicals, such as the drain openers because the various
system seals may be damaged.
Cosmetic Care & Maintenance
After using a pump-out service make sure to rinse the waste
hose with clean water which will help eliminate debris from
accumulating on the waste hose.
Change the in-line waste fi lter at least once per year.
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