RR said:

*It's irrelevant. I bring rye to a raging boil after the 24-hour soak, with the stove on 'high', and have ZERO busted kernels. As shown in the video, rinse grains very well with hot tap water before the soak. Fill the kettle with hot tap water to begin the soak. Add gypsum. After 24 hours, bring to a raging boil for five to ten minutes, then drain and shake. I've never seen more than one kernel in a thousand busted when following the above.

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RR said:

One of the secrets of grain preparation, regardless of which grain, is to rinse the kernels very well before continuing with whatever preparation tek you're going to use. All grains get packaged with a lot of chaff and grain dust that if not rinsed out will cause the grains to stick together later and cause that sticky goo. Put your dry grains in a large kettle and fill with water as you stir it around. You'll see all the dust and other crap come floating up. Slowly dump out the water to get rid of the junk and repeat two more times or until the water pours off clear. Adding gypsum is also a great idea. It will take anyone a few tries to get the moisture content right, regardless of which grain or which tek you follow. If it's too wet this time, make adjustments next time, and so on until you work out your system.

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and then I did a second rinse before it went into the kettle for the boil.

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There went your gypsum.  I never rinse after the soak.  Bring the nasty soak water to a boil, and then pour it out.  This keeps the bacteria infested water out of your sink drain too.
RR

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