Come winter time, "IF" you wish to use an algaecide at closing as insurance, look for a product with Polyquat 60 as the main ingrediant. As Marty said though, this time of year, stick to chlorine - aka regular bleach. Welcome!
We live on the west coast of Florida. For 20 years we have used No Mor Problems. It has been a miracle, especially in the summer. I hadn’t bought it for awhile and the pool is just not right, especially since it got hot. My hubby uses 1 cup a week until it’s clear and blue. Then 1/2 cup week for maintenance. If your chlorine is reading high but green you probably have too much stabilizer. A few years back that happened so we diluted the water and cut back on tablets.
In general, algaecides provide a false sense of security because it reduces the likelihood of getting algae. It is usually that presence of algae that makes one realize that the water is not properly sanitized or safe to prevent disease transmission.
I believe I read at one time that the polyquat either has a slimy feel or smell in the water which some people do not like
As a fellow newbie.....please listen to these folks. They have taught me that this is all I need:
A real testkit. See the testkit info at this site, and get a real test kit.
Liquid chlorine. Tablets are a problem waiting to happen. Only use tablets when you go on vacation.
Muriatic acid. To lower pH. Keep your pH between 7.0 and 8.0.
Borax or baking soda to increase pH. Again, keep it to 7.0 and 8.0.
CYA. This is chlorine stabilizier. Should be ideally at 30ppm (lower if an indoor pool). If you have used tablets for a while, they contain CYA which means you probably have high CYA which affects your chlorine effectiveness (higher CYA requires higher FC).
Don't fight it. These guys know their stuff. I got on board a few weeks ago and my pool is already better for it!