Hello and thank you for all of the great information on this site. First I wanted to post my pool's background, this is my first time owning a house with a pool and I purchased it a year ago. It is a Salt water pool was a SWG, 20,000 gal. I've been using a basic FC/pH test over the last year and adjusting my SWG's levels accordingly and everything had been great until our recent "Haboob" that blew a ton of dirt into our pool (Arizona, might have heard about it as it made national news). Prior to this the pool has always been crystal clear, can see the 9' deep end without any issues. Immediatley after the storm I couldn't view my hand 1' foot down due to the dirt, however after excessive running of the pool filter and my cleaning of the filter multiple times the pool is 100% clear again.
My Issue: Little green circles about half the size of a dime and smaller started showing up on the bottom of the pool, mostly on the steps and the shallow end. After visiting your site I believe I was testing my FC at the wrong time of day and sun was killing my FC level during the day which allowed these alge circles to grow, most likely deposited by the storm. This time of year I run my filter 10 hours a day, and have had my SWG at 100% over the last week. Prior to the Haboob it was only at 60%.
Reading your site also prompted my ordering of the TF-100 and results below, measured at 6:30 PM after a full day of sun.
CYA: <20, could easily see the black circle when vial was full
My quesiton is what should I address first? I am concerned about the CH reading, after adding 60 drops I still see little red circles floating in the test solotion but the background color has shifted to a slight blue hue, but I've had no symptoms of too high CH in my pool? Could this be a new issue from the Haboob dirt?
I'm assuming I should address the CYA level and T/A level first, to bring both up to ~70. Should I do this in a specific order? All at once or gradual? I also think I need to shock my pool more throughly, being at 100% over the last week has started reversing the hold but it hasn't completely solved the problem. I'm not sure what shock level I should aim for?
I haven't started using the BBB method yet as I was waiting for my test kit to arrive first. Prior to now the only additive I've ever added is muriatic acid to control PH.
Thank you for your time and advise,