Thetford AquaBio 96610 RV Holding Tank Treatment Citrus Twist Scent, Formaldehyde Free 64 Oz Liquid

I e tried a few of these products. This one has been the best so far.

Used it in the camper toilet and it worked. There was a slight smell but that is probably because we didn't use enough. I recommend this.

Doesn’t work great in warm weather

Works great! Helps with smell