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I'm planning on taking the step from extract brewing to all grain with BIAB. My plan is to buy a induction hob, 15 gal kettle and a March pump.

Will i need some kind of spacer to keep the bag out of the spigot when i turn on the pump?

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What is the pump for? Most instructions I've seen for BIAB is mash and boil in the same vessel, so the liquid doesn't need to go anywhere until post-boil. Regardless, a false bottom should solve this problem. – Galapagos Jim Nov 21 '12 at 18:28
The pump is to recirculate to keep a even temperature inside and outside the bag. I'm planing to make a system to control the temperature like the Braumeister systems have. – Olsenius Nov 22 '12 at 12:14
Cool idea as it will give you a little more mash control, generate clearer wort and likely increase efficiency a bit. – brewchez Nov 22 '12 at 15:48

Two ideas for you, with the caveat that I have no direct experience with pumps + BIAB, I'm just spitballing here.

A false bottom will keep your bag off the kettle floor and away from the outlet. I couldn't easily see if MoreBeer makes a false bottom to fit that particular kettle, but there's probably a generic product that will fit reasonably well.

A screen on the kettle outlet will prevent the bag from being sucked directly in. I use a tube screen on my kettle to keep loose hops out when I drain the wort, the same should work just as well for maintaining even liquid flow through the bag to the outlet.

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