We have a drilled well with two filters in parallel to ensure adequate flow, so both must be the same filter. I can't speak for others but they removed all the odor from our well water. We installed a power anode last summer which helped some but didn't solve the problem as hoped. It may be the combination of anode and filter, but in any case we have already bought two more filters to have on hand next time. And they come with little month stickers so you know when you've installed them. I don't know if they're all from the same place, but we've tried other similar 'brands' and these were the best for us.
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