We have found this to be an extremely efficient filter system that is well suited to needs of the turbo 500 owner.
The system consists of 2 x 2 gallon buckets, one on top of the other. The solution to be filtered is placed in the upper bucket where it passes through a whole in the base into a large carbon filter, and from there into the lower bucket.
The lower bucket has a tap so that the filtered solution can be drawn off.
Flow rates with this system are fantastic, and we were able to filter 3 gallons in less than 2.5 hours.