Killswitch, don't worry about the sparge. The software does not know what you are doing with that gallon you held back. You can top off your kettle by pouring it through the grains, and it will not know!
There is no way in a standard sparge profile to set a fixed amount for the sparge step. The closest you can come is the way I described; use the BIAB profile which will adjust the mash volume accordingly and allow you to keep back that gallon.
This is about duplicating your process within the constraints of the software.
You can always add another step line to the mash steps which reminds you to pour the gallon of water through the grains if you want the reminder.
IoT projects often require tailored approaches to ensure devices communicate seamlessly and meet specific needs. For example, in brewing,
internet of things development solutions could enable real-time monitoring and control of the mash temperature or sparge water flow, enhancing precision and efficiency.