In an ibc tote you could set up an under gravel filter. A pvc manifold with slots cut in it six inches of gravel over it with a couple of risers with air stones in them. It creates a lift and draws water down through the gravel and sets up a digesting system in the gravel. You have to keep the air going 24/7 to keep the system working. Much cheaper than running a pump. You could also run a canister type filter. That and partial water changes occasionally should be fine.
