I have a new spa that I installed and filled. Got the recommended test kits and check things every day and when things first started out, I was going along fine. I am following Nitro's post and adding dichlor until I get the right CYA value and then use bleach. I use boric acid (my wife really likes the feel of the water with it) and use dry acid to bring down pH and it all works as expected.
I test every day, sometimes more than once a day to try and make sure my FC levels do not go to 0.
But even with that, after a few days, my FC started to go to 0 overnight (even when starting from a level 10). I found a thread that said new tubs can have biofilm after having water sit in them from the factory water tests. So I used Ahhhsome Spa purge/cleaner (actually ran it through, drained it, filled it ran another batch, and then drained and filled it again twice to make sure). I had FC up to 20 just to make sure it would kill what got broken up.
Thought I was in the clear as I started new and had about a week of things going fine, but FC started going to 0 fast again and today water looks pretty cloudy. I am thinking this must be that the biofilm did not get killed completely and the only thing I can think of doing is another purge with maybe a higher FC shock. I just can't see otherwise how things can go south so fast without it being a biofilm that is responsible.
Is there anything else I should do? Is there an upper limit too how much bleach I should add as I don't want to damage any equipment.
I test every day, sometimes more than once a day to try and make sure my FC levels do not go to 0.
But even with that, after a few days, my FC started to go to 0 overnight (even when starting from a level 10). I found a thread that said new tubs can have biofilm after having water sit in them from the factory water tests. So I used Ahhhsome Spa purge/cleaner (actually ran it through, drained it, filled it ran another batch, and then drained and filled it again twice to make sure). I had FC up to 20 just to make sure it would kill what got broken up.
Thought I was in the clear as I started new and had about a week of things going fine, but FC started going to 0 fast again and today water looks pretty cloudy. I am thinking this must be that the biofilm did not get killed completely and the only thing I can think of doing is another purge with maybe a higher FC shock. I just can't see otherwise how things can go south so fast without it being a biofilm that is responsible.
Is there anything else I should do? Is there an upper limit too how much bleach I should add as I don't want to damage any equipment.