Filter or no filter?

[reefcat]

I have a canister filter fluval 205 for my 35g. Every time I go to clean it it leaks when I start it up again. Usually after retrying it a few times it stops leaking. I only clean the filter once a month. But now it wont stop leaking and im thinking of just ditching it, I have around 40 pounds of live rock, a protein skimmer and powerheads, so should i ditch it?