Has anyone tried the "Zapap Lauter tun?" One 5 gallon bucket drilled with small holes along the bottom fitted inside an intact 5 gallon bucket fixed with a spigot/valve that drains to the brew kettle. Mash inside the bucket assembly, then lift and sparge through the drilled bucket as a "false bottom." It seems so simple in principle, and I'm sure there are many drawbacks to the system, but I would love a cost effective way to increase my mash size capabilties (currently doing BIAB in 3 gallon stockpot, so limited to 1.5 gallon batches). Figured I would ask the veterans here if anyone has had luck with this type of system? My goal is 2.5-3 gallon batches.