Schluter White All-Set Modified Thin-Set Mortar, 50 lbs. is a specialized mortar designed specifically for use with Schluter® membranes and boards. This smooth and easy-to-handle thin-set mortar is for both horizontal and vertical applications, making it suitable for ceramic, porcelain, and stone tiles, including large and heavy tiles. It is engineered to work seamlessly with Schluter®-Systems' uncoupling and waterproofing membranes such as DITRA, DITRA-HEAT, and KERDI, ensuring a strong and reliable bond for both interior and exterior tile installations. This modified thin-set mortar meets the ANSI A118.4T, ANSI A118.11, and ANSI A118.15 standards, providing quality and performance you can trust. Model Number: SLRSETA50W