Potassium Pro 2L


SKU: N/A Category:



ReefGrow® Potassium Pro provides the hobbyist with the last of the major ions in natural seawater.  Most hobbyists overlook the importance of potassium since it is not part of the skeletal growth compounds needed by stony corals.  However it is just as important for proper balance as well. It is used for creating pigment in stony corals, especially in LPS (Large Polyp Stony) corals.

Often times cheaper salts tend to have extremely high levels of potassium, if you test high levels ReefGrow® suggests you make up a fresh batch of your salt and test it for high potassium levels.  If your freshly made water  contains  high levels of potassium  ReefGrow® suggests you change your salt brand to a better balanced salt.

High potassium levels often times will lead to retraction of LPS corals.  We have never seen it lead to death but, Duncanopsammia axifuga seem to be great indicators of potassium levels.  If levels are too low or too high they tend to stay retracted into their stony forts.

Typically hobbyists who can actually adhere to weekly water changes of a quality balanced salt shouldn’t need to dose potassium. However those who tend to do monthly water changes should first test potassium levels and then determine if dosing is needed.


Empty contents of this package into a clean and sealable two liter bottle.  Add enough water to fill to two liter mark with distilled water or RO water (again why pay premium price for something you already have.)  Finally secure bottle tightly and shake well.

Note – Always do proper testing before dosing your aquarium. ReefGrow® recommends you keep levels close to that of average natural sea water, the way nature intended, for optimum health & longevity of your reef.  Average natural seawater total potassium levels tend to be at or around 399 ppm.


Beginner – Use .4 mL per gallon (4 mL per 10 gallons) of tank water daily. Check potassium levels regularly and adjust dosage amounts accordingly.  You can also use our friendly web-app to build customized weekly dosing schedules.

Expert  – Each 4 mL/10 G raises potassium by about 10 ppm.  Calculating your actual usage by testing and modify your dose levels accordingly to keep potassium levels balanced.  Then only replenish what your reef uses in a given twenty-four hour period.

Additional information


2L Refill Packet, 2L Jug


There are no reviews yet.

Be the first to review “Potassium Pro 2L”

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.