Then use a minor amount of liquid soap or detergent in the water AFTER
you apply gypsum. A 30 minute soak right now is excessive. It can
result in wasteful runoff.
A 30 minute soak right after applying gypsum will wash away the gypsum.
The initial wetting down should be less than a 5 minute sprinkle, just
enough to make the gypsum damp. The next day, a 5-10 minute sprinkle
will start the gypsum dissolving; do not sprinkle long enough to puddle
or start rinsing the gypsum away. (Sprinkling instead of flooding will
hasten the dissolving of the gypsum because of the force of the water
landing on it.) Then every third day, repeat the dissolving sprinkle.
David E. Ross
Climate: California Mediterranean, see
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