Mary Kate that is a good alternative. Here in Oklahoma
in our pond group a number of people that have ponds
that are around 750 gallons in size and in full sun
have gotten those covers to cover their ponds. Around
here they were on sale for a while for $29.95, not the
highest quality, but they have worked year after year.

Tom L.L.
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Mary kate wrote:

Forgot.....you know those 10x10 foot tent looking things, but they have
no sides, just a roof to provide shade at parties...just a thought ..at
least when the temperatures are up there. They sell them in sporting
goods stores.