I read the instructions on slamming the pool and followed it as best i can using bleach for shocking and working the filter 24/7.
Before shocking, the water was clear, I only had algae on the walls and bottom of pool.
Cya : 60
Using the calculator I added the necessary amount of bleach.
In a couple days I was able to brush off The algae on the walls, also the patches at the bottom became smaller
But then the improvement stopped, i still have algae stuck firmly to the bottom.
After a week this is what is left in the deep end:
There are also smaller patches in the shallow end, spa, and the steps.
Also in the last 7 days the cya dropped lower and lower. Today it was less than 30 (thats as low as my test kit measures). The CC has dropped to zero for the last 3 days or so.
But the Fc does keep dropping so I keep adding. Since the improvment stopped i raised the Fc to 'mustard algae' level.
My guess is, since CC has been zero, the chlorine isn't killing anything. As for the cya I read in another thread the algae could turn it to amonnia maybe thats happening but i have only a small amount of algae so i am not sure. And i guess Fc is dropping due to sun light.
I also bought a BBQ cleaning steel brush to see if the stuff can be scrubbed off, i couldnt get it off. I didnt try too hard in order to avoid damaging the plaster.
Any advice? Should i try some other algaecide or buy a steel pool brush?