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Pond/Water Misters/Foggers Answered

Does anyone have a pond fogger/mister and knows what frequency (Hz-Hertz) ultrasonic thing vibrates at.

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http://www.alibaba.com/product-gs/432769941/ultrasonic_water_atomizer.html

. A lot of retail units operate at 1.5-2MHz.

Try here on eBay, I'm watching the small ones go for around $12 plus $10 shipping, with a replacement disk thrown in.

. I saw a few units in the $20-40 range when I Googled "ultrasonic fogger" to find out the frequency. You can find some recommendations by Googling "ultrasonic fogger +DIY", but you'll have to do some digging. . Most of what I saw used piezo transducers.