: I would try the distilled water like perp said.what is the TDS or EC meter reading?I wait till they are about 10" or 12" tall then flower them.I read some where that submersible without a grounded plug cause the iron to fall out the solution relatively fast with along with high levels 0f dissolved oxygen from air stones and pumps.Thats what Botanicare says on there bottle of CAL-MAG PLUS.: Well that's mytwocents: PEACE