Looking at the Aqua-safe instructions you linked to again & I see it has what's called the "exclusive E-Z Flush Flow Restrictor". Is that what you have on yours or did you retrofit your current adjustable flow restrictor? Where is it in the photo you posted, or do you have a better close up of the thing? If it's a combination flush valve/flow restrictor, maybe there are 2 adjustment mechanisms on it, on for tweaking the flow & another for flushing? Can't tell by your photo or the diagram in the Aqua-safe instructions. If there is indeed a flush mechanism your issue may be a simple as ensuring it's in the "non" flush position?
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