Most eco-minded folks can't use the terms "pool" and "efficiency" in the same sentence. Yes, pools can be resource hogs. They can require substantial amounts of water and electricity, not to mention the chemicals that are used to balance the water. However, pool owners need not let guilt take over. There are a few affordable and easy things you can do to improve efficiency.
The timer settings on the pool equipment can be changed to reduce electricity consumption. On average the timer setting can be set to 6 hours of operation during winter months and 12 hours during the summer months. Longer circulation doesn't necessarily reduce the growth of algae. In addition to appropriate circulation, using chemicals in the water and scrubbing the walls are great ways to reduce the potential for algae growth.
Consider using a pool cover. Pool covers can decrease pool heating costs, minimize the pool’s chemical use by 35%-60%, conserve water by reducing the amount of make-up water needed by 30%-50%, and reduce cleaning time by keeping dirt and other debris out of the pool. When choosing a cover, look for durability, ease of taking on and off, price, warranty, material transparency, insulation value and safety.