IMO. Get rid of the bigger chamber and use just the hose (if that's
possible). I use just 1/2" diameter clear hose part on my 35 gallon patio
pond. Course I start it by sucking on the hose till I almost swallow water
and then I drop it in the bucket or cap it with my thumb, then drop that
end into the bucket.

You do realize that the siphon will stop when the level in the bucket is at
the same level as the pond, right? ~ jan


(Do you know where your water quality is?)