If you go to this page you will find the refill.
http://www.poolsolutions.com/cart/items.php
the phenol red in the K-2006 is taylor number R-0004. This is the reagent you want to order. If Ben is not selling it anymore you can get it directly from Taylor Technologies, Leslies, or many pool stores.
the ps 234 uses Taylor number R-0014.
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