I ordered 3 of these to replace 2 old bricks I've had for more than 2 years of the same model that just wore out and needed replacing. With new ones, only part of the stone lets air bubbles through. The 3rd order was actually a replacement for the 1st 2 I ordered thinking I had received a defective product (it was easier to replace 1 to check if it was defective or just substandard) . I say I bought 3 because I still returned 1 which I requested a replacement for and not sure if it took too long for a refund. Let's see when I can find the return label. It turned out that all three had the same problems. In the photos posted the air pump is fully raised which I never had to do on the old ones replaced. And yes, I soaked them overnight prior to installation and even scrubbed them well to remove any dirt or stone particles clogging the air holes. It did not work. The price is great, but only if the items really work as they should. I will have to buy another product to replace the ones received.
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