I never know what my ppm are. But, it has always worked.
! - 9 volt battery or you can hook a couple 9 volts together..Up to you.
2 - Silver Quarters... Yep, they are not 99.999999999 Fine Silver ( You Don't need Fine Silver, Sterling will work)
3/4 pint Distilled Water
Let it cook for 24 hours. Strain off the top solution and keep. Toss the crap on the bottom.
Repeat process 1 more time. Strain off top solution once again . Toss the crap on the bottom.
There you go. CS solution, That's it. Works for me every time.
Just some advice. The plant you decided to CS . Should be sent to flower and the CS process started at least 2 weeks in advance of the others. That way the pollen will be ready to use. When the others flower.