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I think grey PVC has the same specific gravity as white PVC (~1.3, only slightly heavier than water's 1.0), but I think the grey pipe is usually thicker, which means a heavier weight working against the buoyancy of the noodles. May not make a huge difference but who knows. I'd originally...

I also had this same problem on my 15' Intex, but I went the cheap and simple way to fix it. Basically, I've abandoned the air ring as the means for keep the walls of the pool afloat. Instead I bought four 1/2" PVC (10 foot each), four 1/2" PVC couplings, and about 9 pool noodles. I joined...