Pool finish faling?

[mneal]

I don't have a calcium hardness test in my little kit, it has been on the low side since the pool was new and I have slowly added calcium hardness. I have been doing it slowly because my local PS, tends to tell you to add to much according to the PB.
I have cleaned the filter lots of times since pool was new, this however is first time since the surface has cured I saw the milky dust from cleaning. I knew when the surface was brand new it was normal, now that the pool is not new, that is why I am worried. I am going to PS for complete H2O test tonight after work and will post results.

I had a second filter so I installed that to get pressure down and will acid wash and dishwashing detergent the old one to clear it up .

[mneal]

I finally got a second to get water tested at PS:
TC 4.0
FC 4.0
CC 0.0
pH 7.6
TA 100
CH 250
TA 100
TDS 750

Langlier Index 0.0 (what is this?)
Sequestrant 5

Any thoughts from the pros?

When I look super closely at the top surfaces of the spa and pool steps it kind of looks like the surface is slightly more pited and all most porous looking then when the pool was brand new. Is this normal (and I might be imagining this) . I can only see this when water is perfectly still and full sun. I don't see the signs of visible dust when I brush the pool like I did when the surface was new and marcite was curing.

[mneal]

ttt. anyone have thoughts?