He is a spammer, check his other posts...
Mine is in crystal form. It's sold as "Bull's Eye Crystal Drain Cleaner" from a local hardware store.
Home depot, black bottle of drain opener liquid power its called. 50/50 mix of potassium and sodium hydroxide. $5. And wow! It took a ton of baking soda to draw what teaspoon of this stuff does. My cell is 99% cleaner! No mud!
I found that adding neutrals called for more electolyte. Baking soda worked ok with my first 12v one bay cell, but with my 5bay it needed 5 times the amount and turned to hot mud.