Russ and my pool guy were both right! My independent water test shows that the pool has been maintained well but that the free chlorine is being compromised by the high levels of nitrates and phosphates. I looked at internet sites and the clear consensus in these circumstances is that draining the pool partly or completely is the most effective and least expensive solution.
I think I will try to contact the maintenance people at Nancy Lopez simply to inform them of the possibility that their fertilizer is being blown into my pool. If I'm nice enough about it maybe they will avoid spreading fertilizer on windy days. Then we will have a perfect world.
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