The <b>K-Type SCD Probiotics-X pipes and cylinders</b> can be used to energize and structure water. Also used in toilets, fish or water tanks, &amp; ponds to structure water and reduce dirt and slime build-up. A handful of these pipes in the laundry will structure the water and increase the cleansing power of soaps. These ceramics can tolerate heat and control oxidation and free radical production. Use them in frying and storage of oils to protect them from oxidation rancidity, in produce to extend freshness or in a vase of fresh cut flowers to maintain their beauty. The pipe has a hole in the center while the cylinder does not. These ceramics can be used and reused and should never need to be replaced.