Backyard Aquaponics
A place to discuss aquaponics

Thanks Rupert. So Sodium Thiosulfate pentahydrate is an acidic solution (thus lowering PH) that will readily give up a H+ ion. I think wikipedia calls this Brønsted acids (proton donors) - shameless copy & paste . Makes sense now why lowering your PH (makes it more acidic) reduces the toxicity of ammonia as even naturally some ammonia will be converted to ammonium. One could simply dose the tank with hydrochloric acid to have a *similar* result however I have read that HCl will not give up its H+ ion as readily as Sodium Thiosulfate pentahydrate, which I guess is why its used.

So I guess the question is Sodium Thiosulfate pentahydrate harmful to humans? I can understand why they suggest to induce vomiting if consumed (from bottle) as it is an acidic substance, however the MSDS seems to suggest it is non-toxic. What would it leave behind once in a tank and bonded with Ammonia?

Nope - not for me...I'll have to read this thread at least 5 times before it even starts to make sense...

Mark

so what is the bottom line on eating tilapia who have been swimming in ammo-lock treated waters?
obviously one would choose tilapia from non-treated water in stead, (given the choice)
but, . . .
what i am asking is are they safely edible?
or should i just trash them?
jesse