Frequent mole med application has any implication on soil or grass?

This fall suddenly I see a lot of mole activity in my front yard. I did apply a thing called mole-med or mole-be-gone in a dry granular form sold $19 a bag. I used it since the cover said its bio-degradable and non-poisones. Also I found it easier to apply using a garden broadcaster and even easy to throw some inside the bushes. Since we hade a very rainy fall season, I think the rain has swept or dissolved this stuff and today I see some new mole activity, after an absence of about 45 days.
Iam wondering should, I reapply the same crystals, or should I get the castor oil and spray it, Frequent applicaiton will have any implications on the grass? Iam in zone5.
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