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Yes. The technology has made huge strides since then. For example, our solar collectors use propylene glycol instead of water. Propylene glycol is a more efficient heat transfer agent, it doesn't freeze, and algae won't grow in it. It is safe and nontoxic. And of course, the collectors look great on your roof.
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I've seen houses with old solar collectors that are full of unsightly algae. Can that be avoided?
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