uvc

Hi Can someone tell me which would be better to get between the following. D-D complete 48w UVC unit D-D complete 20w UVC unit ( equivalent to 40w uv ) 1000lts/hr My total system volume is 832 litres Currently got an algae bloom cause be temp spike as I was away… temps was at 29 degree c for...

Could I put an inline UV sterilizer with the sump return pump, maybe use some silicone tubes coming out of the pump into UV out and convert it back to pvcs? any help appreciated