The bioforce filter range has been improved they are compact and highly effective pond filters bioforce filters now have higher pond size ratings and come with kaldnes k3 biomedia and reduced cleaningr the bioforce 4500 has an 11w uvcr all bioforce sizes have been with the following features for high performance and ease of user r mechanical filtrationr more efficient and less cleaningr through flow coarse foams reduce filter cleaning frequencyr profiled foams present a larger surface are