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Our spa spillover shelf has come completely loose and I would like to know what is the best product and technique with which to anchor it back down. This shelf, that appears to be made of marble, has a lip that overhangs the pool which provides leverage to pop it up and off it's shelf seat, so...

Has anyone collected and tested simultaneous samples of a still pool, one from the top and one from the bottom? If so, we could answer the question of whether cyanuric acid is evenly distributed or settles near the top or bottom of the pool. If we knew where CYA collected, we could more...