For a 4,500 gallon pond you will need a fairly large TT filter.
In my 3,000 gallon pond, I use a 75 gallon water butt which contains around 12,000 flocor pieces. Aim for a container of a similar size, if not larger and it should be fine.
Alan
Posted on Dec 11, 2005, 11:04 AM from IP address 213.120.101.21