I need to buy a new canister filter as my old one isn't working well. My CO2 system works with an AM 1000 reactor which is set up to the canister filter. The AM 1000 reactor states that the minimum flow should be 1000 l/hr. I am interested in an Eheim filter. I know that the flow rate of canister filters tends to slows down with usage. So what is the minimum flow rate you would consider on a new filter to have the reactor work efficiently?