New Oase Combi Drun is just coming out, think it takes 100 litres of Hel-X 13 and has a full size drum. Was also intrigued to read about a ‘phosphate remover’ module...no idea how effective it is.
From the manual:
"The purpose of Module M 4 (phosphate binder) is to convert nitrate into gaseous nitrogen (denitrification) and, above all, to bind phosphates which, in particular, notably restricts the growth of string algae. The majority of the volume is filtered in the secondary flow. In this manner, a low oxygen environment is created inside the foam filters which favours the adherence of denitrificating micro-organisms. The smaller part of the volume flow is guided through the Phosless inserts where special phosphate binders ensure the adherence of the phosphate."
New Combi unit:
https://www.gardensite.co.uk/aquatic...pact-l-egc.htm
Phosphate remover module:
https://www.gardensite.co.uk/aquatic...der-module.htm