Brightwell Aquatics Potassion-P High-Purity Potassium Supplement for Reef Aquariums Supports Coral Growth & Color Enhances Blue Pigmentation Restores Potassium, 600g

Very good 👍

Works great for my reef aquarium

Does the job well. Much more economical for a large system, but can very well be used for any size system. Now that I am checking K, I didn’t realize how much it is consumed! Wow You will see a difference in your sps (coral) growth! Always use it with checking the L, never dose blindly. ( Salifert has a good reliable quality test kits)

I bought this product on the recommendation of the Reef Moonshiners web site, and used it for corrective dosing based on the results of an ATI ICP test and on 80% of my reef system's water volume. Both months I used according to the mixing instructions, it caused RTN of some of my SPS colonies. This last time it was a pretty large colony that had formerly been thriving. Next month, if I need potassium, I'm switching to the RM brand. It may cost more initially, but it's supposed to be more "pure." The cost of the SPS I lost alone is quadruple the cost of the supplement. I am so bummed about losing this beautiful colony that had recently added a ton of growth corallites. This was a wild maricultured acro, so I know they are sensitive, but still. It definitely didn't kill all my SPS, and didn't appear to harm any other types of coral, but as expensive as coral is, why take the chance? If you do use this product, dose over at least double the number of recommended days, just to be safe.

mixes clear and leave nothing behind