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(DIY) buy at HD, apply leak seal from inside OR 6 i8 F( N/ V/ ^5 m0 e5 Z& p! J" H% K' V. v# s
hire some professional company that armed with high pressure injection equipments to do the leak plug.
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should work, high pressure injection is the best and have lifetime warranty.; N1 Y$ W3 h& [+ C* V
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hairline cracks not going all the way through wall is not unusual, Q7 i( B4 o) a9 p& ?% n
' K0 l; s3 d W9 N7 F/ P. a3 Z/ Mbig crack is rare, if possible, I rather back off