In Filter Mode the spa does not pull water through the filter. Virtually no suction.
For past three weeks I have sent photos and mpegs to the Dimension One service staff showing still water inside the filter ring while the spa is in Filter Mode. I had a Certified Dimension One tech come on site to verify the spa does not flow water into the filter. Dimension One's response was to remove the filter and submerge a white plastic shopping bag around the intake: if the submerged bag even slightly clings to the intake, there is no warranty claim.
This is of course a ridiculous test for water flow through a filter. Do not purchase a Dimension One Spa!
Monetary Loss: $4500.