2" Ozone Resistant Oblong Diffuser Stone Set-- 6 Gray (MP-Series)

Buy 6 stones at the price of 4 stones. Each set includes 6 pieces 2" Ozone Resistant Oblong Gray Diffuser Stones. (Note: tubing is not included with the stone set. To purchase tubing, please see PTFE Tubing (by the foot) and make sure to select the MP Series for the size. If you wish to use flexible tubing, please see Flexible Tubing (per foot).) Shipping Policy: Please see our Shipping Policy Page for details. Our official A2Z Ozone Diffuser stones are made of crystal quartz glass and have a coarse texture. This allows the ozone gas to be expelled through the stone creating fine bubbles that spread the ozone evenly throughout the water.  The difference between the white stone and the gray stone is that the bubbles will be smaller with the white stone. It is simply a matter of preference, as either stone will work for your water application. These stones are made exclusively for the MP-Series Ozone Generators. Directions: On the O3 OUT (5), loosen the outer part of the bulk head, and i