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APC put out a small line conditioner that might refine the rough wave form but don't know if it big enough or clever enough to make a difference. Line interactive UPS's are normally pretty large beasties wired into server rooms and even the small versions are pretty expensive. Over a thousand dollars or thereabouts ( my wife is in the UPS business, specs and sells APC gear) and if you want good sinusoidal wave form then it is not going to be cheap.
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