Pumice is an excellent additive to your bonsai soil mix. Medium Grain size.
This listing is for a 1 Quart Bag
Also available in small and large grain.
Atlas Scientific pH Calibration Solution Kit 4.0 & 7.0 ...
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Earth Juice Grow 718660 EARTH JUICE GROW GALLON
Espoma GL6 Garden Lime Soil Amendment, 6.75-Pound
Akadama for Bonsai - Small Grain - 5 Quart