# Help with leaf problem on some plants

**URL:** <https://ilgmforum.com/t/help-with-leaf-problem-on-some-plants/3170>\
**Category:** Customer Feedback\
**Created:** [September 28, 2015, 9:43am UTC](https://ilgmforum.com/t/help-with-leaf-problem-on-some-plants/3170 "2015-09-28T09:43:25Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![MacGyverStoner](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/macgyverstoner/32/80714_2.png) [@MacGyverStoner](https://ilgmforum.com/u/MacGyverStoner)\
**Post date:** [September 28, 2015, 11:58pm UTC](https://ilgmforum.com/t/help-with-leaf-problem-on-some-plants/3170/11 "2015-09-28T23:58:55Z")

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EC is electrical conductivity and TDS is total dissolved solids in parts per million. Basically it is a way of measuring or estimating the concentration or strength of minerals and/or nutrient salts in your water, nutrient mix or your soil.

Check out this grower’s post, they had some similar questions and are also totally new:

> [@Purple kush but she's getting these yellow spots on her what is it](http://ilgmforum.com/t/purple-kush-but-shes-getting-these-yellow-spots-on-her-what-is-it/3177/5):
>
> I never understood how to ph water and to check all those levels what can I do the plants are ph no nutes yet it’s organic soil I’m using cfls

~MacG

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