If you use the ATO to dose kalk the pump and tube can get plugged up with residue. Even if you don't dose kalk I would give the float and the pump a good vinegar bath. I clean mine every 6 months or so.
I've never used any other brand but BRS...they work fine.
Okay thanks Jim! I wanted to get this ordered last night but no one answered me lol do you have any ideas on how much I'll need to start off with?