Low water pressure in the water supply: pumps Grundfos UPA, Wilo PB

If in the house, the water pressure decreased so that household appliances stopped working normally. If someone else opened the tap, you can’t wash yourself normally in the shower. How can I solve this problem in this video.
1. Grundfos UPA 15-120 AUTO 98699677: www.pompa.kiev....
2. Wilo PB 200 EA 4081896: www.pompa.kiev....
3. Speroni SCRA25/150-180: www.pompa.kiev....
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