My CSV1W is not very old, (2 years+) and it has stopped working entirely. It stopped working for about a week one month ago and it appears to be permanent this time. Water pressure is normal, water flow is normal - it's just as if the CSV was never installed. Any ideas? I have a water softener for calcium and an iron filter, but neither one is for an extreme problem. Is there a way to take it apart without special tools?