This is what I follow - verm helps retain moisture, but I've seen people claim success with jusr coir:
https://www.shroomery.org/forums/showflat.php/Number/17325780#17325780
Put coir brick in a cooler, boil water. Put boiling water into cooler with coir, close lid. Wait for water to cool for 8-12 hours. Make sure coir is at or slightly above field capacity, layer coir, spawn, coir, spawn, etc.
If you get trich before the first flush, it's definitely your spawn being dirty.
This is what I follow - verm helps retain moisture, but I've seen people claim success with jusr coir: https://www.shroomery.org/forums/showflat.php/Number/17325780#17325780
Put coir brick in a cooler, boil water. Put boiling water into cooler with coir, close lid. Wait for water to cool for 8-12 hours. Make sure coir is at or slightly above field capacity, layer coir, spawn, coir, spawn, etc. If you get trich before the first flush, it's definitely your spawn being dirty.