hm,.. 3 years supply of prime...

[genocidex]

my last purchase from petmountain, i threw in an extra 500ml bottle of prime to bump me over the 75$ shipping limit thing, thinking ill probably use it all in a year any ways. just did some math, and apparently 2 500ml bottles will treat 10,000 gallons of water... that means i have just under a 3 yrs supply. if all my tanks are running (most arent atm) and i do a minimal 50% wc weekly (my 55 and 10g get about 33% due to stocking) wicked.... hope this stuff doesnt expire on me XD lol

[Aeonflame]

Order a 1 kg bottle of safe and you will have a lifetime supply of conditioner.

[mizzoutank]

Lol,
I just purchased 2x500ml bottles too! but I always doubledose because it just feels super weird to add so little to the tank when I do the pwc.

Better than turning through 500ml in a month!

[Rue]

I keep mine in the fridge...if it's been opened. I hope that makes it last longer!