TF-100 Chlorine Drop Test - Red?

SR56

Member
Feb 8, 2020
11
Orlando, FL
Pool Size
14100
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Truclear / Ei
I did this test twice and similar results. I put in the "heaping scoop" of 0870 powder. Not too heaping, but enough to cover the spoon. Put it into the 10ml of water and it turns brick red.

I'm a little color blind, so figure maybe it's me. I continue. I add in the 0871 drops. The first time I stopped before it went clear because I figured there was no way my chlorine was that high. It was like 30 drops. The second time I kept going and it was 58 drops before it turned kind of clear.

So this is saying I have 29ppm FC?

Waterguru read at 9ppm around noon. It's been pegged at 10ppm until today. Assuming if chlorine is that high the accuracy is off.

The dual chlorine & ph box cylinders show the reading much darker than the high level. Like a dark orange. Had my color-abled girlfriend check this one for me. 😁

I haven't added any chlorine since Sunday, and my Jandy Truclear has been at 50% since Monday.

Does this seem accurate? In total I added 2.5 gallons of 10.5% bleach over 4 days after starting at 1-2ppm then going to slam mode.

Reducing SWG to 20% for now.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,886
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
So this is saying I have 29ppm FC?
If you're in SLAM mode with a CYA of 70, that's pretty good since the SLAM FC level is 28 (56 drops). The water sample will become a deeper, darker red with more chlorine like that.
 
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SR56

Member
Feb 8, 2020
11
Orlando, FL
Pool Size
14100
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Truclear / Ei
Also, since you are in SLAM mode, you can just turn the SWG off or set it to zero % since we typically use liquid chlorine to maintain the SLAM. Plus, it will be easier for you to monitor expended chlorine that way.
I didn't have a reliable chlorine test until the TF-100 arrived today so I had to wing it a little and dumped the last of my liquid chlorine Sunday. Figured it would start coming down by now. Water looks very clear. Black algae appears gone.

I'll shut down the SWG and keep checking. Probably start working SWG back at 7ppm.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,886
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Since you are in a SLAM, do your best to maintain that FC of 28. At some point, once you see the water is 100% crystal to the bottom and you have 0.5 or less CC level, then you can look at doing an Overnight Chlorine Loss Test. In the meantime, take advantage of the elevated FC level to scrub and break-up any black algae roots that may have tried to dig in there.
 
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