Do I need to add calcium?

[medvampire]

I remember reading in the forums there was a problem with the HTH hardness test. Went looking for the thread couldn’t find it.
As for hardness with a vinyl liner I will refer you to this thread.
Steve

[waterbear]

The documented problem was with the AquaChem kit but I believe the HTH kit has a similar problem. Here is the thread
http://www.poolforum.com/pf2/showthr...light=aquachem

[medvampire]

Thanks Evan
Looked for that post for nearly 30 minutes.
Steve