You have a serious pH problem You need to adjust your pH to near or above 7.0.
Your problem is compounded by having copper plumbing. Eventually, the pipe will deteriorate to the point they develop pin holes and water will come out. If these pin holes happen behind walls, you are in big trouble.
As pH drops below 5.0, sometimes it is motre than just a high level of gaseous build up and may include mineral acids. Nonetheless, you will need to address this asap.
The green tint you are expereincing is most likely the copper breaking down and staining 'bout everything it touches.
A simple acid neutralizer (Calcite filter) won't work, or at least it won't bring it to a satisfactory level. Even mixing Calcite with mag-oxide will fall short. One method may be a sodium hydroxide (strong base) feed. This will help resolve acid water and won't raise hardness levels.
Ideally, it would be good to re-plumb to plastic plumbing...and neutralize acid.
Don't wait till the pipes explode. get on it now.
Andy Christensen, CWS-II
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