First test results with TF100 kit:

Shawman

Bronze Supporter
Jan 5, 2021
16
North Houston
Pool Size
20000
Surface
Plaster
I had our 60+/- deg pool heated to around 90 deg for a week between Christmas and new years(dreading getting the gas bill) with little chlorine in it evidently so it turned a nice shade of pond green shortly afterwards. I found this site and tried to initiate the SLAM without having a good test kit.
I put roughly 3 gallons of 12.5%(I think) from Pinch a Penny pool store in and removed the rest of the pucks from my chlorinator over a week ago. Having only the cheap Taylor test kit I had no idea what the chlorine topped out at but it was BRIGHT yellow, so I bought the TF100.

Here are the first results from the new test kit I took last night:
FC-5
CC-0
CYA-50
CH-325
TA-110
Ph- 7.8-8.0?
I have always had problems reading/comparing the chlorine and ph level colors correctly in the windows of the regular test kits. I tested it with the small taylor kit and I would have thought it was at the 2-3 level but the new kit says 5.
Let me know what you think of my numbers and where I should go from here as far as adding anything.


Thanks
 

Shawman

Bronze Supporter
Jan 5, 2021
16
North Houston
Pool Size
20000
Surface
Plaster
I need to slam it again when I have no visible algae and 0- CC? I get the Ph but Im not sure why I need to SLAM again.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
34,769
Laughlin, NV
You did not say you have followed the SLAM process. You passed an OCLT, crystal clear water with no debris, and CC less than 0.5?
 

HermanTX

Gold Supporter
May 20, 2020
1,175
Katy TX
Pool Size
14600
Surface
Plaster
Chlorine
Liquid Chlorine
I put roughly 3 gallons of 12.5%(I think) from Pinch a Penny pool store
Just so you are aware - Pinch a Penny is 10.5% Chlorine (actually 10%) if you read the details of the labeling.

In addition to the TF-100 test kit you should get the PoolMath app to figure out the effects of adding chemicals.
Glad that your CYA is low. That is helpful to maintain your chlorine levels

After a SLAM, it is always best to do a Overnight Chlorine Loss Test. This confirms no hidden algae.

Also, with the TF-100 kit for FC you do not have to compare colors. Using the powder you are looking for a color change from pink to colorless. You only need to use the color comparator for pH - unless you purchase a pH meter.
All tests - FC, CC, CH and TA using the TF-100 kit is based on a color change rather than a color comparison. That is a big plus for those that have issues seeing slight color variations.
 

Shawman

Bronze Supporter
Jan 5, 2021
16
North Houston
Pool Size
20000
Surface
Plaster
Just so you are aware - Pinch a Penny is 10.5% Chlorine (actually 10%) if you read the details of the labeling.

In addition to the TF-100 test kit you should get the PoolMath app to figure out the effects of adding chemicals.
Glad that your CYA is low. That is helpful to maintain your chlorine levels

After a SLAM, it is always best to do a Overnight Chlorine Loss Test. This confirms no hidden algae.

Also, with the TF-100 kit for FC you do not have to compare colors. Using the powder you are looking for a color change from pink to colorless. You only need to use the color comparator for pH - unless you purchase a pH meter.
All tests - FC, CC, CH and TA using the TF-100 kit is based on a color change rather than a color comparison. That is a big plus for those that have issues seeing slight color variations.
Thats right, Pinch a Penny was 10.5 and NAPCO was12.5 I forgot. I drive by NAPCO going to Pinch a penny so I will get it there from now on. I thought I stated in the original post about how I did the SLAM and my CC was 0 but maybe not. The water is clear and I clean the baskets daily. Do you think I need to SLAM again???
 

Shawman

Bronze Supporter
Jan 5, 2021
16
North Houston
Pool Size
20000
Surface
Plaster
I just tested FC and went from 5 yesterday to 4.5.
Water temp is 50 deg.
Pool math said to add 37oz of chlorine
Ph is 7.6
 

JJ_Tex

Gold Supporter
Bronze Supporter
Jul 17, 2019
2,200
Prosper, TX (DFW)
Pool Size
13000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
That is good that you passed the OCLT.

When you say you need to add 37oz, what are you targeting as your FC? That seems a bit low to me.

If you look at the FC/CYA chart in my signature, for a CYA of 50 the target FC is 6-8. That means you want your FC to stay in that 6-8 range all day, so I would actually target 7.5 or 8 when you are adding chlorine to ensure you stay in target until the next time you test and add chlorine.
 
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Shawman

Bronze Supporter
Jan 5, 2021
16
North Houston
Pool Size
20000
Surface
Plaster
That is good that you passed the OCLT.

When you say you need to add 37oz, what are you targeting as your FC? That seems a bit low to me.

If you look at the FC/CYA chart in my signature, for a CYA of 50 the target FC is 6-8. That means you want your FC to stay in that 6-8 range all day, so I would actually target 7.5 or 8 when you are adding chlorine to ensure you stay in target until the next time you test and add chlorine.
The pool math app autopopulated a 6 as the target FC, I didn’t enter anything so that’s where it calculated the 37 ounces I guess.
so are you telling me I should try to keep the target at 7.5-8 all the time?
 

Homebrewale

Well-known member
Apr 21, 2020
358
Apex, NC
That is good that you passed the OCLT.

When you say you need to add 37oz, what are you targeting as your FC? That seems a bit low to me.

If you look at the FC/CYA chart in my signature, for a CYA of 50 the target FC is 6-8. That means you want your FC to stay in that 6-8 range all day, so I would actually target 7.5 or 8 when you are adding chlorine to ensure you stay in target until the next time you test and add chlorine.

Did his pool really pass the OCLT? He stated the water temperature was 50F. At that temperature, you expect very little algae growth. Therefore, I would expect that even if algae is present, the FC would not drop much due to water temperatures.
 

JJ_Tex

Gold Supporter
Bronze Supporter
Jul 17, 2019
2,200
Prosper, TX (DFW)
Pool Size
13000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
The pool math app autopopulated a 6 as the target FC, I didn’t enter anything so that’s where it calculated the 37 ounces I guess.
so are you telling me I should try to keep the target at 7.5-8 all the time?
Yes, at least when you add chlorine add to the top of the range so that as the chlorine gets used up throughout the day.

@Homebrewale has a good point. I would argue that you still pass the OCLT, but it is something to keep an eye on and another reason to keep your FC as far away from the minimum as you can.