Forgive me if this has already been posted in this category but I didn't find it. If not, I thought this might be of interest as a solids filter that can easily be built by yourself. It's something I found on the earthen group website and I've posted a link below. Paul of Earthen groups has told me in the past he does not mind sharing this.
Yes it's aquaculture and aquaponics but I thought if this could be of use to as a filter for koi ponds. I plan on building four of these for each of four aquaculture tanks before going to a centralized rotary drum filter.
According to a published paper I have read a radial drum filter will remove up to 48 percent of TSS vs. much less for a simple swirl filter, so it appears it would be a good DIY prefilter before a rotary drum filter.
http://www.earthangroup.com.au/diy-solids-filter/
Thoughts?