SWIM just bought a bag of garden in a hurry only to discover that it is sold as safer alternative to hydrated lime. It will lower the PH, however it is in brown pellets and is a mixture of 56% calcium carbonate, with magnesium and calcium. Can this garden lime be used for a S/B extraction or should SWIM purchase another product?

Does it say Dolomite lime on the bag ? If yes than its no good.Your best bet is to buy it from here

Garden lime won't work for an STB. Neither will hydrated lime to my knowledge.

Thanks for the heads up...I pass it on to SWIM