Good idea the Marineland water polisher! Such old school equipmentTo reduce roll usage, try @Enderg60 's suggestion and raise the Reefmat so it sits higher in the sump.
To reduce roll usage when you are away for extended periods of time, you could get one Marineland water polishers which you can easily put in and take out as needed. I am purchasing one so I have it on hand to polish the water after major tank cleanings so I can conserve roller fleece.