In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Yes the water in the system does become stagnant, but that really doesn't matter. What matters is that the system be able to put out the fire and or keep it from spreading. And pex tubing to supply water to the sprinkler heads, what happens if the plastic tubing burns through and kills the water supply to the sprinkler heads. Fire protection systems are supposed to be in iron pipe not copper or plastic.If your interested in having this installed in your home, check with a company that does fire protection systems or your local fire prevention officer who is certified to inspect these systems.