Calcium with Ben's test

[mizzouguy]

Ok, everything looks to be in check except for my calcium level. I did the level and it wouldn't turn blue....it stayed clear. There was maybe a small hint of blue, but not very noticable. I read that calcium is required with a heater, but I'm not sure what level.

My current readings:
FC-7
CC-0 (at least I think so)
ALK-150
PH-7.5
Salt-3200
CYA-30

33k gallons, vinyl, aquarite, Water clear!

[mphare]

Actually, this is a good question.
While testing CH it goes from Red to magenta to purple to blue.

But there is a lot of interpretation between purple and blue. What is considered 'blue' enough?

[waterbear]

the endpoint of the titration is reached when the color does not change with the addition of one more drop. When that happens don't count the last drop added. You will see a point when it turns blue and adding one more drop does not change the color of the blue! the purple intermediate colors have been discussed in other threads and are possibly due to interferences from other metals present in the water.