If I should ever get to the point where I have a spa, I would invest in a spa cover, because it does extend the time needed between cleaning. We have a small pool in our yard and while it's great for the kids to cool off when it's hot, it takes more time to keep the leaves, bugs and other material out of the pool than seems worth it. The downside of course to covering a small pool is it creates algae and heats up the water, which defeats the purpose of having a pool if it is as warm as bath water. Hence? No cover for the pool, but a spa? You want to have warm anyway, which is another plus of a cover when it is a bit colder, it helps keep the heat in longer.