Our pool for the past year has a earthy "compost smell" coming from the water when you are in the pool swimming. You cannot smell anything when there is no water movement (Splashing and or swimming in pool). I just took a water sample this morning and you cannot smell anything in the sample???? Can there be gases coming through the pool liner? The liner in the shallow end has nearly faded away (was replaced six years ago). The odor also gets into your swim suits and I can smell it in the filter bag of our robotic cleaner. Also, last July I replaced the sand in our filter. Here are the water test results from this morning : Cl 1, Br 2, Ph 7.5, FC 1.5, CC.5, TC2, TA 70, CYA 50. Water temp 74*, time of test 8:00a.m. I added 125 ounces of (12%) bleach to pool water to bring up the Cl level. Any suggests on how to get rid of the odor would be greatly appreciated!Thanks, Frank