coir is not sterile, you can get away with using it after it’s hydrated with boiled water, but in time it will lead to contamination. This is speaking from experience.
I just fill the tote with the bulk substrate and then bring a few gallons of water to a boil and poor it in and put the lid on....
The old hot water bath, works like a charm.
Even though coir doesnt need to be pasteurized only manure based bulk substrates with the exception of worm castings.
Both coir and verm are sterile right out of the package (unless you get water on it)
I stopped using straight coir years ago and always supplement with E-poo now. I’ll put it in the oven at 170 in the morning and turn it off at night and let it cool down for use the next day. That’s about 12 hours.
If you throw it in the oven for 90 minutes you might as well not even do it at all. The point of pasturization is to kill of some baddies left after the boil and to promote growth of thermophilic bacteria.
e poo? I tried the oven tek with h poo and I dont think I got up to temp at 4 hours even at 200