I have a question about the chugger/march type pumps.
Most pro brewers use an all stainless TC type (rotary centrifugal) sanitary pump. We home brewers are stuck with lifting, pouring, siphoning, or in the fancy setups-- using a small hot water pump for transfers.
Personally I have been using the march 809BR (brass head) for a while now. I realized recently that all march/chugger pumps have a polysulfone impeller regardless of whether it's a brass or stainless pump head case.
I plan to dedicate my 809BR to the HLT, to be used for CIP and hot water ONLY and purchased a chugger SS-C for all wort & beer transfers. Imagine my surprise to discover that the stainless pump still has a poly impeller. How annoying.
So my question is sort of also an idea. Why did the people designing these pumps build a cast metal (brass or stainless) pump head, but then neglect to also fabricate the impeller from the same metal? What if any, are the drawbacks to having a stainless impeller? Couldn't we easily make our own stainless impellers? I mean they'd cost about $1 to produce. I just dont understand why this has not been done already.
Okay #2--- can I drill and tap my own bleeder valve in the pump head to aide in priming during transfers when the hot pump loses its prime and quits pulling hot wort?