Even though algae growth in your pool can be very frustrating and aggravating it’s important to understand plastic does not cause it to grow. Anything that is placed in the water provides the vehicle for algae to attach to and grow.
There are several solutions to this problem. First of all you water chemistry must be as perfect as possible, which can be very difficult to achieve during hot summer months. Your pool dealer should be able to advise you in this area. Secondly, before placing the ladder or steps in the pool at the beginning of the season be sure that the ladder is as clean as possible. A 1:1 mixture of bleach and water is best for this. Also, adding bleach or liquid chlorine to the hollow interior of the ladder or steps will help to prevent algae growth.