Anyone ever used this? Sounds like carbon dosing, or is it different?
https://www.marinedepot.com/AZ_NO3_...p1evzkC5AxN1ihP5T0UzdzjN5RK2FgjgaAqH7EALw_wcB
https://www.marinedepot.com/AZ_NO3_...p1evzkC5AxN1ihP5T0UzdzjN5RK2FgjgaAqH7EALw_wcB


