I used my Polaris 380. Took the bag off. Then placed it in the corner of the stairs at a slight angle so that the venturi jets also contribute with a fountain effect and it doesn't run around. The main water jet in the back works great and you can also use the 'tail' jet to aerate. Mucho bubbles. Of course, it may wind up breaking the Polaris, but mine is still working fine.
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