http://www.amazon.com/OHSAWA?-NATURAL-NIGARI-COAGULANT-LB/dp/B0019L8KUG/ref=pd_sim_k_2?ie=UTF8&refRID=1KS3GQP074NEMNH6VQWN
You can also use distilled vinegar or gypsum.
Amazon has all you need
You can also use distilled vinegar or gypsum.
Amazon has all you need