![]() ![]() I don't know how much light gets through a clear bubble cover, but most pools are able to rise in temperature significantly so I would guess that at least half of sun's energy gets through with a somewhat clear bubble cover. A white plaster pool without a cover absorbs about 60% of of the sun's energy. Though this prevents chlorine breakdown from UV in sunlight so significantly reduces chlorine demand, it also prevents heating of the pool from sunlight, especially compared to a relatively clear bubble-type cover. The other factor to consider is that the automatic covers are generally opaque to sunlight. Based on other pools in the area using bubble-type covers, they seem to lose 1.5-2F overnight. Without the cover on, it loses around 6-7F. I live in northern California (just north of San Francisco) and the pool (starting at 88F) loses about 3-4F at night in the swim season (with 50-54F overnight low temps). Basically, both types of cover eliminate evaporation which is the largest component of heat loss, but heat is still lost through conduction/convection especially at night with cool air (especially with wind). I estimate that it retains heat only about half as effectively as a bubble-type cover. So there is still labor associated with keeping the pool clean, even with a pool cover.Īs for insulation, an automatic cover is thinner and less insulating than a bubble-type cover. However, you have to clean off the cover (with a brush) anyway unless you plan to periodically clean the vault where the cover is stored (by keeping the cover clean, the vault only needs to be cleaned once a year). ![]() The cover definitely keeps the pool far cleaner - we have a cedar tree nearby that dumps cedar needles towards the pool. Otherwise, you would need to use a track on top as shown here (other options are shown on the website). If your in-ground pool was designed to have an automatic cover by having coping with an overhang, then the track can be under the overhanging coping and the cover itself can be hidden in a vault at the end of the pool. I have an automatic electric safety cover for a 16'x32' rectangular pool (16,000 gallons) using an undertrack from Pool Covers, Inc. ![]()
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