Been testing water at pool store and at home with basic pH/chlorine test kit, my Taylor 2006 test kit came in today. We built our pool 10 years ago and was chlorine for first 5 and salt generator for last 5 years, been much easier to maintain with the salt. Our pool is Gunite 16x32 with 3.5ft shallow end and 6.5ft deep end, pool builder says about 17K gallons. Our pool is screened in and stays about 5-10 degrees cooler than neighbors that aren't shaded, I've put a solar blanket over it this summer to warm it up a little.
I recently had what appear to me to be black algae spots along one side, this is same side that had some light green dust like material in the corners. My wife says the trouble is from the increased shade from the solar blanket. I decided to take better control of the chemicals in the pool and order a quality kit. I tested the water with the kit and also took some water to pool store for comparison, they have a nice computer system that they put the water in a centrifuge type device.
My Taylor test results Store results
pH 7.4-7.5 7.6
FC 1.8ppm 1.3ppm
CC 2.0ppm 1.67ppm
Alk 30ppm 35ppm
Cal 290ppm 236ppm
CYA <30 6
Store said everything was OK but needed stabilizer, I bought a jug and told me to add half today and half tomorrow. Said chlorine and everything else was OK, I thought should try to get chorine up a little.
We have no ladder or anything in the pool, the only metal is the ring around light and it looks terrible, dark rusty color and not smooth. I have had several small rust appearing lines in the bottom of pool over the last several years. They look like rust lines from the metal ties that rebar is secured with under the Gunite. I've wondered if its where the unite might be thin and rusting through. Pool installer looked at them and say looks like where something was dropped in pool like and nail and rusted. I disagree because nothing has ever been in our pool like that.
I recently discovered this forum and was wanting some opinions on how my pool is doing. Is there anything else I should check/change?