how long will the water stay this ugly blue color from the algae treatment
Depending =”https://www.pondmarket.com/catalog/index.cfm/category/76/algae-control.cfm”>Algaecide you used and the condition of your pond will determine how long the treatment might take. Any kind of blue tint used to help prevent algae is known as Pond Dye or Tint. Pond Tint is used in order to help block the sunlight from beating down into your pond. Sunlight thrives when there is lots of sunlight present.
I would suggest checking to see whether you are using an Algaecide or a Pond Tint/Dye. If you are using an Algaecide with a tint in it, it would be helpful to know what the product is called in order to answer your question properly.