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Old 06-07-2017, 10:47 PM
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doppler (Rick)
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Join Date: Nov 2012
Location: Mackay
Posts: 1,690
That is an interesting question. I have googled and can't find anything about use by dates or life spans for any of the solar filters. All they say is not to use damaged filters which is of course stating the obvious. I would think that they would have a much longer life span than 3 years, one supplier I found gave a 5 year guarantee.
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