JC;
Simple siphon is an effective (and free) energy source, but 50ft of hose with just a simple siphon (where I estimate only a few feet max of height diff between intake and outflow, if tank and sink are on the same floor), the hose length will present significant resistance to flow and slow it (so it doesn't surprise me that it is unable to pick up much)...opposed to the 5ft of hose I use to drain into a 5gal bucket (which works like gangbusters to suck up debris!)...is there any way you can shorten path, OR increase height diff (by for instance draining to a cellar drain)?
Cheers