Those work great for picking up woody-leafy debris, but fine material, fish poo and uneaten food goes through the mesh bag. They really stir up the mulm on the bottom and make the water cloudy, which is good if you want the filters to catch it; but it can kill your water quality, especially if you have a lot of anaerobic crud on the bottom.It works just like a small gold dredge, here's the claims on the add for this one (costs around $20)
I used I 16 gallon shop vac with a built in pump. The pump drains the dirty water while the vac is in use. Every 5 minutes or so, I would have to pause to give the pump time to catch up, since it vacuums water in faster than it pumps water out. It was very satisfying to see all that gunk disappear. I intentionally left some behind to keep the bacterial colonies.Explain how you did that - it looks good!
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