Large leaking koi pond with 40+ year old koi and a huge modular flow through filter. Pond Works placed fish in temporary tak, dismantled old filter and set up on temporary tank, emptied pond, modified shape and size and re-lined it. Constructed filter base and installed Oae Proficlear drum filter and moving modules with UVC, airpumps and pond pump also, fitting in line water filter and and auto top up system – result crystal clear pond