freetown fred wrote:
Best do something with those fish tank filters also PLUS--the ones I've had, also had fiber glass in them
Best to at least check a little before typing such.
That isn't coal in fish tank filters, it is activated carbon usually carefully made from selected charcoal (coconut shells are a common base). It can be made from other carbon sources but the purity of the carbon is tested to a high standard. Actually, anthracite is useless for chemical filtration since it is insoluble in water, won't absorb chemical contaminants. It is not "activated carbon"
If it was coal ash it wouldn't be black and would release chemicals in water, not absorb them.
Not that it matters, you didn't see fiber glass (at least in the last 5 decades), you saw plastic filaments made for such use. Neither are water soluble anyway so they aren't going to release anything into the water.
This thread has some over the top concerns and a pile of incorrect "information"I'm middle of the road
, I use coal ash on my driveway and have used it as fill in a few places. I don't have to worry about contaminants (if any, I have gotten coal from different mines) getting to my drinking water over decades due to local geologic conditions as some locations have to address. I won't use it in my food garden but have used it in other areas for acid loving shrubs.
I LOVE my PA anthracite, just use some care what I do with the remnants after I destroy it with a nice warm feeling.