hi I have forsale a green 4 chamber multibay filter its just over 4ft long and 2foot deep and 2foot wide this filter has media which includes Japanese matting and black filter brushes it can be gravity or pump fed only selling due to upgrade and would cost more brand new already cleaned and ready for use and it will keep any pond or vat clean no matter what the size must be picked up by van or big car as I have no transport 50 ono is a bargain