Two years ago, We had a "gusher" of a leak in a return line and lost a lot of water quickly. To make a long story short, we bypassed our iron filter (which was failing at the time also) and water softener to refill the pool more quickly. I was not very vigilant at testing the water because I was spending more time digging down to and repairing the line. We have very hard water and the result of all this is our vinyl liner is about 70% covered in white scale. We tried a powder (I don't remember the name of it) that the pool dealer recommended to soften it. It barely touched it with the main benefit being my hardness decreased quickly. Of course the scale gives algae a great foothold and I'm fighting that right now also. Through my last thread I've managed to greatly improve my pool chemistry, but how do I deal with that much scale?

My test readings this morning using an HTH 6 way kit gave me these three readings.
Chlorine (using the color chart) 9 ppm
TA 110
PH 7.2
When I tested for hardness, the sample turned yellow after I put in the 5 drops of indicator and swirled it. I have no idea what that means. Last week it tested at 210. Is my water suddenly too soft? Is the kit defective?

Considering that we have algae clinging to the scale I added 2 gallons of 12.5% chlorine to raise the chlorine level. What should I do from here?
Thanks