These are the one's I'm looking at, thinking of either the 55 or 80 gallon. May even consider running two, one for each pump then going to the filter Was just reading and I thought they had 15 degree cones but actually 45 degree. the 15 degree cones are on tanks far larger than I will be able to use, Or afford. I think I can have a stand built for far less than what the company charges for their stands and I'm planning on having it poly coated to prevent it from rusting.
My plan is using it/them as a Separator/ course filter, then going to a large bio-filter chamber, then separating the flow 1/2 going directly back to the pond, and the rest going thru a Planted tub for water lettuce and or Hyacinths and anachris to help lower nitrates. Still trying to figure out some details as I want to be able to have a minimum of three holding tanks running on one filter system. that way all the fish use the same water but I can separate the males and females for more controlled breeding. I'm also wanting these to be Koi only, No plants in the ponds except for maybe some floating lettuce for them to nibble on, no shelves, complete covers and straight then slightly beveled at the bottom 4'-6' sides. I've got a lot more research to do as I want a filter that can EASILY handle 50+ 24"-36" koi. yes, when I do this I'm thinking VERY BIG! I also want multiple bottom drains, multiple skimmers and multiple pumps so if something fails I still have enough running to sustain the pond until repairs get made. I do not want to run into the problem of the whole system going down because of a single pump failure again. Liner,?? Not sure on this one yet, guess they will depend #1 on location. I don't want to fight cracking issues in something this large! Also going to make this one predator proof! One way or the other! All this depends on when the wife is going to be able to retire. I'm not going to build any of this here as we don't have plans on staying here once she retires. So it's still future plans as of now. who knows what will have developed in DIY filters by then, I've been looking at tower filtering too but so far I still don't fully understand that whole concept. but it is a option to learn about non the less.