Dyofix SGP Shadow 50 - 300ml

My pond was turning green every few weeks, but after adding this dye the water stayed clear and the algae barely grew. The UV blocking feature really works as described, and the color looks natural. It took about 20 minutes for the 300ml bottle to mix evenly in my small pond.

I was worried about the constant sunlight hitting our pond, but this dye blocks UV light perfectly. A single treatment kept the water a beautiful deep blue and stopped algae growth for nearly a month.

The pump runs constantly here, so algae was a weekly battle until this dye cut the sunlight off. Three weeks in, the water's still that deep blue-black shade and I haven't scrubbed the liner once.