Follow the instructions which clearly state that you must wait 15 minutes to start the filter pumps. I have used many products. I have worked with local aquarium shops for many years when I have had water quality issues. I am very happy that I bought. It was a great compliment to the quality of the water. I now use all of Dr.Tim's products without having to consult my local store. Simple instructions to follow the results. It would be great if local stores had this brand.
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