Having had more time to play I have found the following is a method which works for me.
When doing maize/corn, the overflow tube in the centre of the malt pipe prevented a decent stir with the drill / mortar mixer so I did not install it.
This left a problem of a hole in the centre of the perforated bottom plate for the malt pipe and allowed grains to fall through , cake the bottom of the boiler and play havoc with the temperature sensors.
The solution - a large tie top straining bag used for beer BIAB processes.
This sits nicely inside the malt pipe, the top folded down the outside and tied . allows liquid to flow through and keeps the fine grains inside. Agitation via paddle or mixer is no problem.
Now maize and the Hi Temp enzymes are a doddle.
The Robobrew will hold the temp at 88 to 90 for the 90 minutes then the supplied water coil allows it to be dropped in temp for the GL enzyme.
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