Trap Tanks Smell!!!

[Old 66 Car Wash]

Hi All! The temps are heating up and I am experiencing pretty bad odors coming from the underground trap tanks in each bay. So bad, customers are starting to complain. I just had them pumped out a few months ago and they are not yet filled up with sediment requiring another pumping. I was wondering if there is anything I can add to them to cut down on the smell? Something that won't harm the septic system. Maybe an additive?

 

[Randy]

I go to Dollar Tree and buy a couple gallons of bleach and pour it ino the pits then I hang a swimming pool bleach pellet in each of the pits. I use the 3" pellets and made a holder out a plastic container, punched a bunch of holes in it and hang it down in the pit water about foot.