I’ve had an algae problem in the pond, so I thought I’d try some pond dye in it (pond dye is supposed to block out the rays that allow algae to grow). It arrived today so I mixed some up and dumped it in and now the pond is solid black. Methinks I put too much in. It shouldn’t cause any problems, but you definitely cannot see anything now. So, in effect, it has solved my algae problem. I suspect with more rain in the forecast, the pond will turn a lighter color shortly. If not, hopefully the algae that is in there will die from lack of sunlight.