Keeping your questions here is fine ... they may all end up being related [like if your CYA is high, then you FC was likely too low, which would result in algae, which would then clog your filter ]
You should use PoolMath to do your calculations. The Effects of adding chemicals might help here.
If I switch to metric, at the bottom I can input 36g of chlorine gas (I assume this is going to work like the SWG calculations) and with your pool size set at the top, it says it would add 0.6ppm of FC. So for every liter you would add about 0.6ppm of FC.
If I go back to the top and put a FC Now value of 0 and Target value of 0.6ppm, it looks like setting the bleach % to 3.5% would require 1 liter to raise the FC that much.
So, going forward, you could try setting the % to 3.5 and let PoolMath calculate how much to add to reach your desired FC levels. Over time, when you test if you are hitting your target, then you know the pool size and bleach strength is correct. If you consistently miss your target, you may need to adjust the size or the strength.
It is unfortunate that your bleach is so weak.
For the CYA, the lighting plays a huge roll in how well you can see the dot. In the US you can buy a 50ppm standard solution so that you can be sure that you are testing in the correct conditions. Not sure if you can get that there.
You should use PoolMath to do your calculations. The Effects of adding chemicals might help here.
If I switch to metric, at the bottom I can input 36g of chlorine gas (I assume this is going to work like the SWG calculations) and with your pool size set at the top, it says it would add 0.6ppm of FC. So for every liter you would add about 0.6ppm of FC.
If I go back to the top and put a FC Now value of 0 and Target value of 0.6ppm, it looks like setting the bleach % to 3.5% would require 1 liter to raise the FC that much.
So, going forward, you could try setting the % to 3.5 and let PoolMath calculate how much to add to reach your desired FC levels. Over time, when you test if you are hitting your target, then you know the pool size and bleach strength is correct. If you consistently miss your target, you may need to adjust the size or the strength.
It is unfortunate that your bleach is so weak.
For the CYA, the lighting plays a huge roll in how well you can see the dot. In the US you can buy a 50ppm standard solution so that you can be sure that you are testing in the correct conditions. Not sure if you can get that there.