I reuse the fuel. Assuming you transfer fuel into 5 gallon portable tanks and it sits there for a while, pour just the last 1/2 gallon or so of each into a clear container to see if there is any water or debris at the bottom. If so, let it settle out, and slowly pour the good stuff off the top.
I'd replace the strainer at the bottom of the tank if it looks like it can be removed safely. Mine was way fused on there, and I gave up at risk of breaking it . Can't be using sparking grinding tools on tank fittings.
