We have a 36,000 gal pool with a clear solar cover/blanket. The color/thicknes/ect.. really makes little difference as we have had every type. If you keep your pool covered day and NIGHT you can expect to gain about 3-4 degrees per day if the ambient temperature during the day is above 75% and it is mostly sunny or better. The real gain from the solar cover comes at night by eliminating evaporation. As we all learned in science class the process of evaporation cools. Hence your dog pants to evaporate the saliva off from his toung and cooling himself. His own little air conditioner! This is why many vendors call it a blanket versus a cover as it insulates the pool during the night.
One other thing that will help is to have your pump set to come on during the warm part of morning usually 9-10 AM and go off when the day cools off around 9 pm. Cover the pool up as soon as you are done using it. This varies by your climate but running the pump during the day keeps the water circulating and distributing heat through the pool. It has the exact same effect at night but it circulates the water up by the cover where the water is cooler. Once your pool is up to temperature (we like 80%) be carefull if you leave for the weekend. We have made this mistake only to come home to find our pool at 86%. At this temperature you can have algee blooms overnight. If it happens it would be a good time to shock the pool
One last disclaimer we live in Michigan, not in Arizona where this advice would never apply. Hope this helps.
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