EDTA 17% SolutionCompare to Ultradent: EDTA. EDTA 17% Solution is specifically engineered with a LOWER pH for optimal performance. For best outcomes, a LOWER pH is more important than concentration. As pH increases, the availability of calcium ions from hydroxyapatite for chelation decreases. Curion is proud to be an authorized distributor of Vista Apex products in Canada. This product is backed by the manufacturer's warranty.