Where can I find calcite to put in a filter housing to raise the water PH level? I used copper water pipe in the house 8 years ago and did not realise how acidic the bore water was. I constantly have blue green stain in my shower and I'm thinking if I don't remedy the problem soon I will be replacing all my copper piping.

To make things worse the copper pipe I used was C grade as that was all I could find at the time, not long after I finished installing the pipe I found an air conditioning business with A grade copper, mmmm.

If I can't find calcite stone is there a calcite cartridge available in Thailand?

I am in Nakhon Phanom but am prepared to travel to get what I need.

Any suggestions would be great.

If you have a water tank you could add some soda ash, and test the ph with a pool test kit. once you have got it right you will be ok a bit hit and miss to start with, but once you get the quantities right you are in business

No tank, straight from bore to house. That's why I'm thinking if I run it through calcite in a big filter housing it will up the PH. Might not be totally neutral but will help.