Try just bubble washing and save water. I also "spay wash" by pumping the bio onto a plate that allows the bio to "fan" back into the wash tank. I do this for about 4 hours than just bubble for a day or two. All the while I run an aquarium heater to keep the bio at about 34 deg C.

After a day of bubble washing I drain off the glycerol from the bottom of the wash tank and do this again when I have confirmed the batch is washed.

If I want to speed up the wash process I just "spray wash" longer.

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Maverick
Canberra