I'm ready to start all grain brewing. I have decided I would like to use Igloo style water coolers for my mash tun and sparge tank. What i don't know is if I need a five gallon or a ten gallon cooler. I will only be brewing 5 gallons at a time, so... Also, some of you guys have really cool fly sparging setups. Any DIY help on building a really good fly sparge arm setup that would work off of gravity fed water?