Maytronics Dolphin DX User Instructions page 11

Insert the filters with the plastic
backing facing out.
Insert the cartridge unit.
In addition to the standard cartridge filters the Pool Cleaner may be supplied with Spring
clean-up filters which can be used for the first cleaning of the season or when the pool is
unusually dirty.
CAUTION
Robotic Pool Cleaner DX4 User Instructions
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Clean the filters with a hose.
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