I have one tank on randys sodium hydroxide 2 part and another tank on Kalk slurry. I also use brs mag but barely need it.
https://www.reef2reef.com/threads/second-new-diy-two-part-recipe-with-higher-ph-boost.357080/
https://www.reef2reef.com/threads/second-new-diy-two-part-recipe-with-higher-ph-boost.357080/