Check the TDS of the water you get and see if it's zero or near zero. It could be that the water you're purchasing is suplimented and may already contain calcium.

It's my belief that calcium is necessary throughout the plants life. Better late than never in my opinion.

Just wanted to add that the micro has calcium in it, so you are providing it, however, if the water is RO water, then the micro needs a little help...ie...calmag+

GM
GluteusMaximus Reviewed by GluteusMaximus on . CalMag with GH 3 part nutes The setup: Basically a bubbler / drip hybrid, my roots dangle into the reservoir which has an airstone. The grow is going great, we're in week 6.5 and my leaves have just started spotting (began last week and I understand this is normal), buds are shaping up nicely. I'm still giving full strength nutes with RO'd water and will begin a pH'd flush next week. I've never noticed anything that looks like trace mineral deficiency; the leaves have always been an even green tone... so are trace Rating: 5