salty joe
Active member
I was going to make Randy's iron supplement (algae is my main export) and have iron sulfate heptahydrate and sodium citrate. But, the iron sulfate heptahydrate's label says max Cu 0.001%. It's my understanding that algae removes copper at low levels so maybe it doesn't matter, but IDK for sure.
The sodium citrate label says USP, FCC.
Do you think these are OK to use?
The sodium citrate label says USP, FCC.
Do you think these are OK to use?