Just finished up this DIY filter for the 130g koi pond I just put in last week. Quick run down of what parts I used are as follows... 2.5g bucket with tight fitting lid 730gph submersible pump Hose Matrix pond media Filter floss Light diffuser section Basically it works as a bottom draw canister filter where the pump draws in water through all the holes drilled into the bottom of the bucket. It then flows upwards through the matrix pond media and then the second stage is the filter floss for water clarity.