A
Anonymous
Guest
They are. I've never done a test on them, but thousands of reefers use it, and have done so for several years without any ill effects. I know it usually is worth it to get the best product, but you can get a bag twice the size of a jar of Kent Kalk for like 90 cents or something. The same Kent product is like $20.
Copper will not stick to a magnet. I'd be very curious to see exactly what that metal is as well, and if it's related to the kalk. It might just be dust, or bits from impellers.
Copper will not stick to a magnet. I'd be very curious to see exactly what that metal is as well, and if it's related to the kalk. It might just be dust, or bits from impellers.