Foz Down vs: GFO

[maron6977]

I go thru approx 7g of ato a week . I have a 15g reservoir. I add 8ml of fozdown per 5g . No power head to keep mixing , just when initially adding to reservoir. Seems to stay stable over the 2 weeks it will last. But evaporation does vary , so am going to dose into sump.