I have a fiberglass pool and like to keep my calcium at 100 - 125, you can do this by adding cal hypo shock, or some calcium. Since you will have to keep your chlorine at a minimum of 8 and shock at 25, you can accomplish raising your calcium with cal hypo over a period of time. Follow the "Best Guess Chart":


Stabilizer . . . . . . Min. FC . . . . Max FC . . . 'Shock' FC
=> 0 ppm . . . . . . . 1 ppm . . . . . 3 ppm . . . . 10 ppm
=> 10 - 20 ppm . . . . 2 ppm . . . . . 5 ppm . . . . 12 ppm
=> 30 - 50 ppm . . . . 3 ppm . . . . . 6 ppm . . . . 15 ppm
=> 60 - 90 ppm . . . . 5 ppm . . . . . 10 ppm . . .. 20 ppm
=> 100 - 200 ppm . . . 8 ppm . . . . . 15 ppm . . .. 25 ppm

You will have to invest in a good test kit, or follow the "shot glass method":

1) Get a shot glass (like you use to mix drinks).
2) Get a gallon of steam distilled water--most mass-market drug chains stock it, and many supermarkets.
3) Mix one shot glass full of pool water with one shot glass full of the distilled in a clean container (like a Pyrex measuring cup).
4) Fill your test cell to the line with the mixture. Add your drops and take the reading.
5) Whatever you read, double it. If it says "3ppm", you have 6ppm. If it reads "5ppm", you have 10ppm.
6) If it's STILL seems like the chorine's too high to read, go to step seven....
7) Mix 1 shot of pool water with TWO shots of distilled water, and re-run the test using that.
8) Now TRIPLE your reading--if it reads "3", it's 9. If it reads "5", it's 15ppm.
9) Going beyond two shots of distilled to 1 shot of pool water is possible (3 shots, quadruple your reading) but you lose accuracy fast. Still if it's the best way of reading chlorine, then you have to do it.

CAVEAT: ONLY use this method to measure chlorine levels. Do not use it for the other tests you run, and do not use it with the FAS-DPD powder test--that goes to 50 to 100ppm of Free Chlorine anyway.

You almost have your alk where you want it. Depending on your fill water, your alk will raise or lower will adding the water.

You are doing a great job, keep up the good work. Having a cya of 100 is not bad as long as you keep the chlorine in the right levels. With a fiberglass pool I don't like to get the ph over 7.6, I like to keep it between 7.2 & 7.6. Fiberglass pools tend to stain with high ph and high chlorine - if there is ANY metals in the water. Feel free to ask any questions you may have. The most important thing to taking control of your own pool it to get a good test kit. The one sold on this site is the best I have used, and you will be able to get support on how to use it here on the forum.