I researched this topic quite a bit and have already started taking steps to get the calcium scaling under control, but I am treading into territory where I have no experience and am not altogether confident that I am doing the right thing.

I have a Taylor K-2005 Test kit, I see you recommend the K-2006 which I can get when I need more reagents -
I balanced the pool chemicals in Sept when we shut it down, pH was 7.4 and everything looked good. When I opened up the pool cover to check on it in March - I got the following readings:

pH 8.0 (as high as the scale goes) It took 4 drops of reagent # 5 to get it down to 7.6
FC 0
TA 100
CH 180
CYA 0
Temp 42F

I also measured phosphates and they were through the roof - (above 1000 ppm), Salt 3000

I noted way more scale than when we had closed it over 80% of the surfaces are affected, the steps were rough like 36 grit and at that time I scraped some off and it bubbled furiously in vinegar and also in muratic acid. The crystals look clear when in the water and white when out of the water.

I added acid and then decided to set the pump to run 6 hours a day and checked it weekly through the month of March - I kept the pH between 7.4 and 7.8 by adding acid regularly (went through 4 gallons of acid in March)

The scale was not improving so I decided to pull the pH down to 7.2 and keep it there as best I could, I added 64 oz of Purple Stuff and this seemed to help over the next two weeks. The scale was still very hard, but it did come off of all the tile and it became smooth. The scale stubbornly clung to the hydraazo.

I called Jacks and they suggested Solution #2 and directed me to some instructions - I waited a while to see if I could get things to improve without spending the money on this solution - but with no improvement by the end of April - I ordered 4 qrts of purple stuff and enough solution #2 to dose the pool.

I put the Solution #2 in according to the instructions 1 week ago. I have seen no additional improvement yet.

I have been keeping tabs on the pool, today's readings are:

(I started using chlorine tablets as I re-plumbed the heater and salt cell out of the circuit before dosing with Solution #2)

FC 1
pH < 7.0 according to the Taylor test, it is <6.8 according to the test strips I bought
TA 40
CH 250
CYA 0
Temp 72F

Phosphates still > 1000 ppm and Salt 2700

So far, the most effective means for getting the scale off is to use a left over tool tile and just scrape it off. I was hoping that it would go back into solution with a little less work . . . perhaps I am being too impatient?

Has anyone else used this treatment with this kind of scale and gotten good results?