I have a spare set of hoses from my old pump before I installed my sand filter. Can algae live in the hoses even though they are dry and have not been used in over a year? They have a greenish tint from when my old pump failed. Just wondering in case I need them. Also, I read somewhere that cartridge filters are better than sand filters. They are not talking about the standard paper cartridge that Intex sells with their pools right?