Just a quick note for some. Coffee pot cleaners, the powders etc, many of them use sodium carbonate as the active ingredient / main ingredient, and in many cases only ingredient to clean the scale out. you can read on the label, check msds for the product and with a little creative research find out exactly what is in the stuff. One such product called Brew Rite uses sodium carbonate..... well an 8 ounce bottle cost close to 3 dollars in some places, you might be able to get it for 2 dollars in other places. The same ingredient is the active ingredient and ONLY ingredient in many Pool Chemicals. Aqua Chem Ph Increaser. It is 100% sodium carbonate and cost about 4 dollars for a 4 pound jug of it. i have tried it and it works great, just as good as the more costly stuff to clean my filters with ( there is no reason it wouldn't it's the same identical stuff) Just a way to save a few bucks on some of the necessities we need to do our coffee right. Oh and before you go towards, well it's not as good it will poison you... #1 Sodium carbonate in the concentrations you use it, wont kill you #2 you rinse it off your filters when you are done anyways, so it won't kill you and #3 you throw it in a swimming pool and soak in it.... I don't think it will kill you. Aaron yah im a cheap busserd and proud of it, a penny saved here and there is a penny that can go towards more greens or eventually a hot top.