Not Sure

gotgone

Member
Oct 7, 2009
14
SW IN
I have 25000 gal IG Foxx pool. I had a new liner installed mid april. At the same time I replaced the sand in the filter. Since start up I have been using the BBB method. I usually add 2 to 3 gts of 10% chlorine each day. I use Taylors FAS test kit to check FC and CC. The chlorine usually reads the same in the morning as the night before. I take the FC to 5 each night and by the next evening I am somewhere between 1.5 and 2. Over the last few days I have noticed the FC drops to 1 or less by noon. The CC has always read 0. I brush the pool at least 3 times a week. I daily brush the areas around the returns when I add chemicals.
A week ago I noticed the returns seem to have reduced pressure. I checked the pressure gauge on the filter and noticed it was a bit high. I decided to backwash and wash shocked at the color. The sight glass showed a dark greenish grey color. I backwashed till the glass was clear.
I talked to the pool store last monday and found a possible reason. When they were pumping the water out of my pool, which was almost black with slime, their pump burnt up. They finished pumping the water using my pump, supposedly on bypass. I now wonder if I have an algae prob.
The water is crystal clear. I see no signs of algae. There is a bit of sand on the floor but that is from the grandkids using the pool. I am able to vacuum it easily. I does not disperse like algae always does when I brush it.
I brought the FC up to 5 at 11:00 last night. I checked it again at 1:00 this morning. Still at 5. At 8:00 the FC was at 3 and CC at 0.
Here are my latest test results.

FC 3
CC 0
PH 7.8
Alk 110
Hardness 200
TDS 260
CYA 30

Is it time to shock? According to the pool calculator I need to take the FC to 11 and keep it there. Do I need to add an algecide. Without seeing any algae, I'm not sure which one to get.
I also have a hard time keeping the PH below 7.8 or 8.0. I have added acid 3 times in the last month. The PH drops to 7.4 and gradually rises to the current level over 3 to 4 days. I have my jets pointed up to improve circulation. The water is swirling at a pretty good rate but there are no bubbles.
Sorry for all the questions but could sure use some advice.
 

duraleigh

Admin
Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
31,502
Sebring, Florida
I can help with your shock question
The water is crystal clear.
Add to that that you have no CC's and shocking would seem unneccesary.

However, you have been letting your FC get just a little to low (keep it between 3-5ppm).

Perform the overnight FC loss test to confirm you don't have anything growing in your pool. Instructions on how to do it are found in Pool School.
 

Butterfly

TFP Expert
LifeTime Supporter
May 30, 2007
10,045
South Carolina
gotgone said:
I brought the FC up to 5 at 11:00 last night. I checked it again at 1:00 this morning. Still at 5. At 8:00 the FC was at 3 and CC at 0.
At the 8:00 AM test, had the sun already hit your pool?

Here are my latest test results.
FC 3
CC 0
PH 7.8
Alk 110
Hardness 200
TDS 260
CYA 30

Is it time to shock? According to the pool calculator I need to take the FC to 11 and keep it there. Do I need to add an algecide. Without seeing any algae, I'm not sure which one to get.
I also have a hard time keeping the PH below 7.8 or 8.0. I have added acid 3 times in the last month. The PH drops to 7.4 and gradually rises to the current level over 3 to 4 days.
It is not unusual for many of us to add acid weekly. You might want to drop pH to 7.2 instead of 7.4.

I have my jets pointed up to improve circulation. The water is swirling at a pretty good rate but there are no bubbles.
Having the jets pointed up and breaking the surface will aerate which will increase the rise in pH.

Sorry for all the questions but could sure use some advice.
Folks here are happy to answer questions and give opinions :-D
 

gotgone

Member
Oct 7, 2009
14
SW IN
I did the overnight test. At 11:00pm last night, the FC was between 5.5 and 6. CC was 0. At 5:45 this morning the FC was 4.5 and CC was 0. The sun was up but not yet on the pool. Any thoughts? Thanks again for your help.
 

Bama Rambler

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2009
22,958
SouthWest Alabama
Just for grins, I'd do the overnight loss test again tonight. Try to get the evening test a little after dark and the morning test a little before daylight.
 

gotgone

Member
Oct 7, 2009
14
SW IN
The FC was at 1.0 when I got home at 7:45 tonight. I added 2 gal of 6%. I thoroughly brushed the pool after the addition. I will try again tonight. Thanks for the help
 
Thread starter Other Threads of Interest Forum Replies Date
G Pumps, Filters, and Plumbing 5
H Pumps, Filters, and Plumbing 2
S Swimming Pool Start-up and Closing 12

Other Threads of Interest