fighting mustard algae

[Kateyru]

I didn't remember correctly about the light. My husband got in the pool before I started shocking. The screw was so rusted that he was afraid it would break off and cause more serious problems. any suggestions about that?
I'd also thought I get our pool guy to try to remove the light as he likely has more experience....tho a service call is $75.
Thanks!

[Kateyru]

Update: Pool guy wasn't willing to try to remove pool light. Hope no lurking algae back there but time will tell. I removed the treads on ladder the other day while still shocking.

I'm now letting FC drift down. Water looks great, very clear. FC = 7.5 this morning. On Thursday, CYA wasn't showing up when tested (not sure what happened) so I added 3 lbs. through a sock. That being 1/2 the amount needed to get CYA to 70. I am leaving town in the morning for 2 weeks. So, I won't get an accurate read on CYA until next Thursday???? What do you suggest about adding more CYA? I'm checking FC and pH daily.
Thanks.

[aylad]

If you're planning to run your SWCG, you need to add whatever amount of CYA the manual for your unit calls for, and that' usually around 80 ppm. If you are not running your SWCG, do you have somebody to take care of the pool while you're gone for 2 weeks, so you don't have to start over when you get back?

[Kateyru]

Yes, I'll run SWG on regular schedule. My manual says CYA should be 60 to 80. So I should go ahead and add enough CYA NOW to get to 80 ppm? My husband will be at home but he is not overly helpful with the pool. If I go ahead and add CYA, the FC and pH should be tested everyday for several days? Hope I can convince him (the husband) to test...
Thanks.

[aylad]

Yes, go ahead and add whatever amount you need for your SWCG. The FC will definitely need to be tested (and adjusted if necessary) on a daily basis. The pH should be okay if he tests it every few days....

[Kateyru]

Thanks!

[Kateyru]

Hi Guys, I'm back home and pool looks good...not visible algae but high FC may be compensating. So, here are current results:
FC = 10.5
pH = 7.7
CYA = 50
TA = 90
I know that CYA needs to be higher. Do I lower pH and TA first or raise CYA?
SWG was running at 65% so have turned it down to 35% to lower FC. In the past, running it at 50% has kept FC steady.
Thanks!!!!

[aylad]

Leave pH and TA alone and add CYA.

Janet

[BigDave]

I wouldn't drop the pH just yet, let it get closer to 8.0. When you do lower it, bring it down to 7.5/7.6. This will drop your TA. When the SWCG brings it back near 8.0, lower it again. You will be performing the TA reducing procedure but slowly.

Go ahead and bring up the CYA and good luck with the yellow algae.