Ok, so my nitrates were zero, so I dosed 2 teaspoons which should have raised the level to 10ppm.
Carried out a nitrate test a hour later and still zero??
Rather odd dont you think?? Maybe it takes longer to dissove down? Im not sure.
Im not adding more, ill wait till im due another dose and test again.
My phosphates are higher than they shoud be without dosing, this is probably casuing the algea bloom. I will keep an eye on that.
I have Hagen test kit for the phosphate and all I can say is its rubbish, dont buy one. One of the bottles is spose to self despense when you turn it upside down. It does that, but when you turn it back upright it pours out everywhere. So I've prob lost 10 or so tests!!
One more thing, I think im right in say 1mg/l = 1ppm
??
If not this is were my test kits are going wrong, cause im dosing in ppm, but testing in mg/l.