I am curious as to wether this will work in a drain and fill system. It passed the vinegar test, I have ordered a ph testing kit to see if it messes with levels. I have found this stuff for free, and it was put into a kiln, but i do not remember what the guy told me it was. And since it is free, I was wondering if i could get away with using it. Couldn't i just put smaller holes or add a screen to the bell syphon?
Looks like either slate or . . . . darned if I can remember the other but it looks like something commonly used in ap - should work very well.
Not too small? It is not 3/4" but it feels very light weight, and not harsh on the hands.
either expanded slate or shale. 3/4 inch is recommended. I'm using 1/2 with no problem. Yours looks smaller. Free - I would try it. You need a gravel guard around your siphon, regardless of which media you use.
Alright, I am going to try it!
how long did it take for issues to show up? I have tested it and it is sitting in water, i have ordered a ph kit to check that, but there were no bubbles when i poured vinegar on it.
The dust that required rinsing more in the second batch showed up as soon as I began washing it. The first had not been so difficult. The pH issue did not present itself right away and was more than a week before it was realized that the pH through out the batch was different in three areas. So a more thorough wash and mix was required. So, I suggest doing your pH tests in three or more grab locations. And if they will, have your supplier mix any combined batches thoroughly.
I would use Black Cinder Gravel again but I'd be on top of these two issues and watching for others.