Air escapes before it hits the stone. I soaked it for two days and when I finally had time to add it to my aquarium I was very disappointed. Tried all air pressure ranges. Think I got a bad one. UPDATE: They sent me a replacement and this stone was not defective. This is exactly what I wanted in my pool! It's worth it if you want to use a fine to medium bubble bubble stone in your pool. With stone and great customer service, definitely a 5 star product.
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