It will work and if the temperature outside is just right and you get the combination just right, it can actually be fairly violent, going off in a few seconds.
It is in the SAS materials of both Wiseman and Davies and appears in interesting literature on French Guiana, etc., as a water purification method - just the PP, not the Glycerin.
Bob Cooper who markets the Mk III Survival Kits that used to have the tiny little Leliera (can't remember the spelling but I have one!) survival knife, his kit contains PP, it's called, "Condy's Crystals" as well and that's the name he uses for them in this small vial. He also has a single Glucose tablet and with half of that tablet and a like amount of PP, you can use a stick to crush and grind this mixture as friction sets this combination off...although I have not tried that yet, I'm sure Cooper is not wrong.
PP has many uses and I guess it is really personal preference but I don't think I would use it for water purification purposes unless I found someone who really knows what they are doing with it.
I think it was quite popular with the Special Air Service because it is also an anti-fungal in the jungle and that would be a very important component in survival and first aid kits for that environment.
It can also be used as a mouthwash to get rid of oral problems in the jungle.
It can be used to stain snow, very tiny amounts will do this - a very small vial could be used to spell out SOS quite clearly in extremely large letters in the snow.
I have a friend who is about ready to retire, he is a Pharmacist and that has been his occupation all of his life, he is in his 70s and I asked him about this substance and among so many things he talked about, he said that Doctors actually did prescribe PP concoctions for persistent foot and crotch fungal infections and the history of the substance is also marked with a bit of darkness, having been used as an abortive in douche form before Roe V. Wade passed in the early 70s.
Henri Charierre speaks of drinking water purified with PP in his book, "Papillon." I don't think he explained it quite well or there was something lost in the translation. I think that was a base that you used to purify even more water with, not totally dissimilar from using iodine crystals and one ounce of water (as Ron Hood shows in one video) to purify a quart of water.
The reason I HIGHLY RECOMMEND that you do NOT use PP for water purification purposes is because the only source is Wiseman and Davies and they're not giving exact measurements but instead are relying on the color of the water after treatment with PP.
I have had this substance, just about a half dozen tiny crystals, on my fingertips and it will make your fingertips tingle for over 30 minutes, this is an incredibly powerful chemical that should not be toyed with when it comes to firestarting and definitely, most certainly, do not ingest this material in water until someone comes along that knows precisely what they are doing with it and puts out some solid information on it. If it makes your fingertips tingle and it's just a few crystals, who knows what the hell it would do to your internal organs.