clone stem rot problem

been using the peat pucs for cloning with decent success but have hit a road block. seems like every clone rots below the peat. using various strains, tap water (unknown ph/chlorine/etc.) and shultz root stim. any suggestions appreciated.

jeff

too much water standing ? i wet my jiffy puck well shaped it up to get more stem in and filled around with pearlite in the lil jiffy greenhouse thing.. think i rewett it maybe 1 time and it had sprouted roots in about a week and half no root hormone etc

A few drops of h2o2 (hydrogen peroxide) per gallon or try a product called no damp.

I use the h2o2 cause its cheap and goes a long way.
Just make sure you use only a few drops.