Mg, Ca, and Nutrient Lockout Issues..Need Help

303 said:

I read a post from Uncle Ben saying that leaving the water for 24 hours is a myth. After that I stopped doing it..

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well, with all due respect to UB, while it's clear that the evaporation process is not always as simple as 'let it sit overnight', chlorine does indeed evaporate from water, however the question of when it evaporates and under what circumstances are less clear. I do believe that in the case of chlorine, allowing water to sit for 24 hours in a wide open container (as opposed to a narrow cylinder in a closed space) will result in most of the chlorine in it to evaporate.

As is well known, in many places chloramine is used instead of chlorine, and the former does not evaporate from water in any case.

The reason I don't let my tap water sit for my less important plants is that, as one must admit, chlorine doesn't really make such a big difference. It may kill off some of the good micro-herd, together with the bad of course, but in decent soil at least, these guys can renew themselves more rapidly than we add chlorine.

asaph said:

well, with all due respect to UB, while it's clear that the evaporation process is not always as simple as 'let it sit overnight', chlorine does indeed evaporate from water, however the question of when it evaporates and under what circumstances are less clear. I do believe that in the case of chlorine, allowing water to sit for 24 hours in a wide open container (as opposed to a narrow cylinder in a closed space) will result in most of the chlorine in it to evaporate.

As is well known, in many places chloramine is used instead of chlorine, and the former does not evaporate from water in any case.

The reason I don't let my tap water sit for my less important plants is that, as one must admit, chlorine doesn't really make such a big difference. It may kill off some of the good micro-herd, together with the bad of course, but in decent soil at least, these guys can renew themselves more rapidly than we add chlorine.

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I put chlorine in my ez cloner, can't be that bad... clear rez from the guys who designed the ez cloner. UB is a legend I'll stick with his literature.

Chlorine is actually needed by the plant in minute amounts, it may hurt the microherd a small bit but not much. Chloramines are to be avoided if possible because these can build up in the soil and cause damage but most dont have these in the water supply.

As for cal/mag levels in ppm imo i reckon about 80ppm calcium and 30ppm magnesium should do it but every other water would be a recomended frequency with your water. Dont worry about chlorine unless chloramines, UB is right as most water companies dont add enough chlorine to cause any harm, house plants been using tap water for years. The only problem comes when you have undesirably high levels of say sodium etc etc but easy to check with water company normally. If waters hard use ro with tap water to bring down ppm of cal/mag and if low like yours use cal/mag supplements to ppm it to recomended tap water levels for plants, 150ppm to 200ppm.

Now that dont look like a cal or mag problem to me, more like heat stress. Peace

Thanks for everyone's help. I will have harvest pictures pretty soon . After looking at my water report more, there is only 1.8ppm of magnesium in my tap water, and 29 ppm of calcium. I am pretty convinced that is the problem I am having. The heat in my setup never gets above 82 degrees so I cant see that being the problem. This problem started only after flushing with tap water at about week 3 or 4 of flowering so it can't be nute burn. pH could have been an issue I guess, so next time I will try to bring it up to like 6.5 at least.

Well reguardless of what it is your water would suit a cal/mag supplement perfectly. Peace

Can confirm most places use chloramine instead of chlorine... chloramine is a solid it will not evaporate you gota filter it