Although this product will not replace water changes to remove NO3.
It does work this morning tested my tank and NO3 levels have dropped to 10 PPM originally 80 ppm ( probably higher).
I will continue with water changes although I may reduce the frequency from twice a week to once a week. The main use of this product will be before I go on vacation or have to leave the fish alone for a couple of days. This product will be part of the pre vacation prep routine.
For what its worth?
It does work this morning tested my tank and NO3 levels have dropped to 10 PPM originally 80 ppm ( probably higher).

I will continue with water changes although I may reduce the frequency from twice a week to once a week. The main use of this product will be before I go on vacation or have to leave the fish alone for a couple of days. This product will be part of the pre vacation prep routine.

For what its worth?