Which 2-part?

[Randy Holmes-Farley Verified Community Expert]

On reefbuilders webiste they were talking about Ph some guy hitting 8.7 with this product, but actually those numbers 8.3 that I saw somwhere they took off. On the product page says if you have problem below 8.15 then this product is for you.

There’s nothing magic about pH and any alk supplements. Its a well understood effect, despite misleading claims by some manufacturers.