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50% of new pools don't have main drains. Builders are moving away from them because of the Virginia Graeme Baker Act, [ Ссылка ] If you have main drains the best thing to do is put a quick disconnect air fitting in front of the pump (there is drain hole in the front of all pumps) use an air compressor to blow air through the main drain line until air is bubbling out of the main drains. Then shut the valve off and immediately shut the air compressor off, this will create an air lock.
Watch & Learn How To Winterize Your Inground Swimming Pool!

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