This is one of those service points that is easy to overlook. You see a swirl of dirt in the main filter/sump and think that's it. However, you smell an overloaded engine and then remember. I checked the old filter and it was visibly clogged. Revain had a filter and shipping was easy with my Prime. Order placed and two days later I had the filter. I changed the filter and suddenly we have a new sweeper. Will be changed in time next time. An excellent must buy.
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