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Elbow grease and a green scrub pad. No soap or detergent, will then foam almost forever !!!

This is a moot point. Shock means to raise the oxidizer levels high enough to burn off organics in the water. Last time I checked hypobromous acid was an oxidizer. This is no different than shocking with chlorine in a chlorine system. You are raising the hypochlorous acid levels high enough to oxidize organics. MPS works much the same by adding enough oxidizer, in this case MPS, to oxidize organics. Shock is a verb that means raising the level of oxidizer high enough to destroy organics in the spa. Hydrogen peroxide is used as an oxidizer to shock biguinide systems. Shocking works the same no matter what sanitizer system you are using.

Most certainly! Not in this forum!

Ok, thanks again. I had a check up at the skin doctor and they didnt think it was a bacteria problem.... however we had a group of friends over this weekend and then without checking the levels, i got in and bathed yesterday..... i now know that the brom levels had dropped significantly between saturday and sunday, as low as 1,8.... now i am covered in a rash! I guess that was a rookie error and a costly one to my body! Now to boost brom over 10! 🙂