Guide to Pond Dye
Using dye in your natural pool or pond is important because it helps prevent algae growth by blocking out sunlight, which algae needs in order to grow.
There are a few key times in the life of your natural pool or pond when dye is especially helpful. The first is when it is new and the biological filter is establishing itself. This can be a vulnerable time for a natural pool and algae can take over if steps aren't taken to prevent it.
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The second key time for dye starts early in the spring and runs through summer. Spring is a beautiful time of year when everything begins to grow back in - sadly this does include string algae too, which is one of the first and easiest things to grow in your NSP. The dye helps prevent that spring sunshine from creating an algae party in your pool.
The image above shows the ideal amount of dye: Dark enough to protect against full sunlight, yet not so much that you lose water clarity and the joy of seeing your fish swimming around.