Last year upon opening the pool, the plaster felt wonderfully smooth, except in the spa, it began to feel jagged. There was also an issue with the coping (pool is in third season) and so upon returning to the scene, they ?fixed? (builder rant insert here). They never addressed the roughness in the Spa. We had brushed it, though how well is debatable. Round Hold, square brush.
So this year upon opening, it was worse. I believe after gathering some info is that its the calcium scale build up. Warm/Hot Spa that doesnt always get recirculated to the main body often enough so my unproffesional opinion is the chemistry in the water is perfect for that type of effect.
I bought pumice block, seems to work somewhat without the draining of water, works even better with light film of water, more of like a wet sanding than total immersion. I dare not to hit it dry. However its really not coming off to my satisfaction. Im wearing out pumice block at a quick rate. One tip, get rubber gloves, between the feeling of the plaster for smoothness and the pumice block I ended up with bloody finger tips.
My next attempt is to mix up a light mixture of Muriatic Acid and use that in conjuction with the the pumice block to perhaps loosen the scale even more so. My concern is with the finish of the pool. I have been putting a bit of elbow grease in to get the stubborn build up off. I dont see white of blue specks in the pumice dust left behind from the sanding. Infact its a bit difficult to see the scale from the white portion of the finish, and the blue is less faint cause of the scale, but its a fine line and the best way i can tell is by feel. I have gotten some good results on the seated areas probably cause its flat and the block conforms to it, and it was probably the most brushed part of the spa when the plaster was curing.
My question is, what % of mix of 34.5 and water should i go at it with first?
I've ordered the TFtestkit, here is the numbers of my last water sample from the commercial place, went by there this morning and the parking lot was overflowing and after hearing they have resorted to using the restaurant pager routine, I am so happy to have found this place
Free Chlorine 8.7
Total Chlorine 8.7
Total Alkalinity 80
Total Disolved 2400
Total Hardness 150
* they had me add the following
4lbs of stabilizer
!gal 34.5% Muriatic
25lbs of Calcium (over 5 days though i havent completed that as of yet)