Green algae forming with FC in range

jimwill

Member
Jun 20, 2021
11
Houston
FC: 5
CC: 0
pH: 7.5
TA: 100
CH: 475
CYA: 40

I just started using TFP about two weeks ago, and my water is looking better than ever. I did an initial SLAM, and my FC levels have been good. However, I've noticed a bit of green algae forming the last two days. I was expecting my FC to be low, but today it was at 5.

I have been lowering my TA for a week now. It was at 220 a week ago. So I have been adding MA each day to bring PH down to 7.0 and using my fountains to create aeration to bring the PH back up.

It's possible that I have miscalculated the size of my pool (10,000 gallons). It's basically a 29 foot long kidney-shaped pool with an extra half circle sitting area, and only five feet deep in the middle.

Any thoughts on why I'm seeing algae forming?

Thanks,
Jim
 

wireform

Silver Supporter
In The Industry
Aug 15, 2017
3,124
Spring Valley, NY
Jim,
Two thoughts, with the additions of MA if it hit what you've been targeting on the PH then you can assume the calculation of gallons is right. Also many people do slams and end it too early either by not having met all 3 criteria or by barely getting the OCLT or simply by doing something wrong. I'd recommend a second slam and once you get a good OCLT then give it one more day of slam followed with OCLT for extra insurance.
 
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Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,622
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Welcome to TFP! :wave: Stick with the SLAM Process, it works. Also be sure to use our PoolMath APP and link your test results to your TFP profile so we can see all your numbers. Good luck! Happy 4th!

full
 
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jimwill

Member
Jun 20, 2021
11
Houston
Thanks for the quick replies! I started a SLAM last night. PH was 7.2 and FC was 4.5 before I began. I checked FC this morning and it was 16.5. Just checked it again and it was 12, so I added more LC. CC has been 0.5 so far.
 
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wireform

Silver Supporter
In The Industry
Aug 15, 2017
3,124
Spring Valley, NY
Just babysit the pool for 2 days and it'll come full circle real fast. Just did a 27' AGP ,started with swampy green water and it had full circle to crystal clear in 6 days. The magic here on TFP works very well when followed to the letter.
 
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jimwill

Member
Jun 20, 2021
11
Houston
I just completed an OCLT (overnight FC loss test). FC was 17 last night after dark, and this morning before the sun came up it was 16.

CC has been practically zero since I started, and filter pressure has been fine. The water looks cleaner than ever.

So I believe it has passed the three tests. Should I continue the shock level for another day and do another overnight test for good measure?
 

Katodude

Silver Supporter
Aug 22, 2017
1,716
West Palm Beach/Florida
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
I would go another day or two. Does not cost much since you are already at SLAM level. Use this time to really brush and scrub everything. Do you have lights with a niche check behind them. Get that weir door and skimmer fully clean.
 

jimwill

Member
Jun 20, 2021
11
Houston
I ended the SLAM today. Water looks great. Thanks to everyone for their comments and advice.

Now that the water is so clear, the stains on the bottom are easy to see. Topic for another thread...
 
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