I just started home brewing and this is my first post. I don't think that I'll ever take my brewing as far as some of you guys

With that being said I have 46 litres of Brew House Canadian Light Lager in 2 carboys at the moment. It is on day number 14 in total and 9 days (out of 10-15 days) in the carboys, Can I leave this in the carboys for longer than the suggested 10-15 days? I age my home made wine this way and wondering if I can do the same with beer? I must add that the dextrose is not added at this time. I'm going to add the 2 carboys to my 58 litre sanke keg for force carbonation.
I've also noticed "floaties" in my beer in the carboys. Can I filter this using my wine plate filtering system? I've read conflicting articles on the Net reference filtering.
Does anyone on here use 58 litre sanke kegs for storage? If so how do you force carnonate your beer? I'm assuming that it is the same as force carbonating with a corny keg?
I have 1 sanke keg at the moment. I'm looking for a second so that I always have one on standby to go in the fridge. Anyone have a spare sanke that they are looking to unload?
Cheers
Chris