Q.using pool water with algae in it to water
We moved into a place where the pool hasn’t been used for two years. We are going to pump it out to clean it and have a garden planted nearby and wanted to know if that water can by used instead of just run off in the yard.

Not having any personal experience with this, my first instinct was to say No, because of the possibility of disease. But a little research gave me more perspective - try this article; http://www.vnwg.com/Helpful-Info/Is-Algae-Your-Friend
So I still don't know the answer. Perhaps professional pool people would know. Or you might try asking someone at the Extension Service. This link will help you locate one: https://www.gardeningknowhow.com/extension-search/