On Tuesday, November 17, 2015 at 1:03:10 PM UTC-5, Stormin Mormon wrote:
On 11/17/2015 11:13 AM, bob haller wrote:

they sell a whistle that goes into the filter, when the filter gets clogged the whistle blows


If you ever find a URL, I'd love to see that. Sounds like a good idea.

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Christopher A. Young
learn more about Jesus
. www.lds.org
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Micky already posted a few links for items as cheap as $3.99 for
a simple whistle to over $80 for a fancy-a$$ electronic sensor.

Look up thread a few posts.