Most herbicides and algaecides are designed for action above freezing, targeting the plants at their best growing conditions. Rule of thumb is to only use aquatic algaecides or herbicides if the water is 45 degrees Fahrenheit or above.
So if you shouldn’t use algaecides or herbicides in freezing temperatures, what does winter pond maintenance look like up north? Adding pond dye and beneficial bacteria will limit the amount of light that penetrates through and lowers nutrient levels in the pond. These products are designed to effectively treat in cooler temperatures. They will not kill any weeds or algae, but they do limit how quickly they can grow in cooler water.
Sanco offers four shades of pond dye that will keep your pond clear and beautiful year-round. All can help settle dissolved solids and with water clarity.
- Crystal Blue: a royal blue dye
- Ocean Blue: a turquoise blue dye
- Black Out: a black dye offering a mirror-like effect
- Sapphire Blue: a deep blue made with a mixture of Crystal Blue & Black Out