HELP dealing with mustard algae!

[PoolDoc]

Run the OTO test, and I'll explain.

[shannon2014]

ran OTO test - water turned bright orange yellow.

[PoolDoc]

OK. Orange means TC > 25 or so.

I just wanted to double check your figures. Do this:

1. Collect some pool water, and mix exactly 1/2 cup of pool water and 1/2 cup of distilled. Test the chlorine level of THAT mixture using the 10 ml sample (0.5 ppm per drop of FAS solution). Multiple the result x2. That's your FC reading. Then, test your pH with the mixture. Take that reading directly, as your pH.

You can't test pH using phenol red when the TC gets above 15 pm. But you can dilute by 50% with *distilled* water, without changing the pH. However, the TC will be lowered by 50%, the phenol red can function as expected.

2. Tell us what FC and your pH readings are, and what you pool water looks like AND what the algae spots look like.

[shannon2014]

OK so it took 41 drops to change from pink to clear..... multiply that by 0.5 and then by 2 So FC is 41. pH is 7.4 Water is clear in low end - in deep end I can see bottom but not clear. Algae spots are brownish grey and dissapate into a cloud when brushed. Spots mainly in low end and on edges of bottom of deep end.

[shannon2014]

Also rechecked just straight pool water sample and got FC 45.5 and CC 0 - after adding R0003 there was little to none color change - did test anyway and it resulted with CC of 2

[PoolDoc]

With FC>40, don't worry about an apparent CC of 2.

PH is OK; I was concerned.

Brush and vacuum the pool -- you're in a good place to get rid of mustard algae.

[shannon2014]

And put bleach in at night? If it rains, should I add extra bleach?
Do I need to add anything else? Algae is getting less ...water seems clearer. I don't need to add salt at this point right?