Of course, I understood everything, I dug for an hour and a half after this installation. I unscrew this filter, put it back, the other pre-filter starts to flow . But I slowly managed it. The service is not very good. If maybe a more professional setup, then maybe. The filter is not very good. But its free installation was very disappointing. After my podug, it has been working for almost a year now. But still, for my money, I want to get not dancing with tambourines . (((
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