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Art,
Here are the manufacturer's recommendations for filter replacement:
Filter Service Life
1st Stage Sediment filter: Recommend changing every 6 ~12 months. Replacement filter Part no. 201
2nd Stage GAC carbon filter: Recommend changing every year. Replacement filter Part no. 204
3rd Stage GAC carbon filter: Recommend changing every year. Replacement filter Part no. 204
4th Stage TFC membrane: Recommend changing every 2~3 years. For RO585, use # 385
5th Stage Inline carbon filter: Recommend changing every year. Replacement filter Part no. 213
A tech rep told me in an e-mail confirmed this & said to dry out the membrane and re-use it, but to discard the other four filters and buy new ones for the next season.
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