The Taylor R-0010-C Calcium Buffer Refill can be used with any water test kit that includes this component. Not all water testing products are made the same! Taylor has been a leading supplier of water testing products and analysis since 1930, providing residential and commercial pool and spa owners with high-quality test kits, reagents, test strips, and water testing supplies. Proudly built in the USA, Taylor pool and spa water testing products can be used for in-ground pools, above ground pools, hot tubs, and spas. Take control of your pool and spa chemistry and see crystal clear water all season long with Taylor!