Very High Chlorine Level

kevinshima

New member
Mar 5, 2017
4
Los Gatos, CA
The chlorine level is very high; instead of a yellowish color, it goes straight to a darker shade of orange. Slight algae growth that I brush away weekly. Recently purchased TF-100 and ran through the tests a few times. Not sure what to do next to have a trouble free pool. Thanks for your help. Latest results:
Cl = orange color
pH = 7.2 to 7.5
FC = 46.5
CC = 0
CH = 875
TA = 100
CYA = 120
Local water some restrictions
 

Analogbytes

Bronze Supporter
Dec 22, 2016
291
Arlington, Texas
Welcome to the forum! Lots of great resources and nice folks to help you around here. I'll start with a few observations and questions. Good job on getting a quality test kit, the number one tool you need for a trouble free pool!

How are you chlorinating your pool, bleach, pucks, salt water chlorine generator?

With your chlorine over 10, the pH test will be invalid. Also, you CYA could be much higher, please look at number 9 here, Pool School - CYA , and retest using a 50/50 mixture of pool water and tap water and multiple your result by 2.

With your CH and CYA as high as they are, you will be looking at having to replace water to have a trouble free pool and only use bleach or SWG as your chlorination method, no more pucks or shock powder. Those 2 are what got your pool where it currently is.
 

domct203

Bronze Supporter
LifeTime Supporter
TFP Guide
Jun 3, 2015
3,959
CT
The chlorine level is very high; instead of a yellowish color, it goes straight to a darker shade of orange. Slight algae growth that I brush away weekly. Recently purchased TF-100 and ran through the tests a few times. Not sure what to do next to have a trouble free pool. Thanks for your help. Latest results:
Cl = orange color
pH = 7.2 to 7.5
FC = 46.5
CC = 0
CH = 875
TA = 100
CYA = 120
Local water some restrictions
Welcome to TFP!

Did you purposely extra-dose the pool to get such an elevated FC level? Did you get 46.5ppm buy using a 10ml sample size and 93 drops of R-871?

You really need to do the diluted CYA test as mentioned above so we can get a better understanding of your pool, and stop using those pucks in the inline feeder. If you have visible algae, there are thousands of algae spores that you don't see. There is no acceptable level of algae in a swimming pool.
 

kevinshima

New member
Mar 5, 2017
4
Los Gatos, CA
Thank you for your replies and suggestions. I am using pucks in a Pentair in-line feeder. It was a habit to just keep it full of pucks, but the feed is turned off now. Will retest this weekend and follow your guidance. Thanks again.
 

domct203

Bronze Supporter
LifeTime Supporter
TFP Guide
Jun 3, 2015
3,959
CT
Those pucks are what is driving up your CYA. Only use liquid chlorine, aka bleach. You can purchase this from the pool $tore in 10% or 12.5% strengths, or from your local Walmart as regular laundry bleach at 8.25%. Just be sure that it is plain old bleach, no additives like scents, or 'splashless' thickeners.

Please have a read through Pool School, it will explain what we teach for a Trouble Free Pool:
Pool School

This will explain the terms we use here, as well as managing chemicals:
ABC's of Pool Water Chemistry

Recommended Levels

Recommended Pool Chemicals

How to Chlorinate Your Pool

Chlorine CYA Chart

Pool Calculator Instructions

Ask any questions you may have, we love questions! :D

Nice to have you here with us.
 

kevinshima

New member
Mar 5, 2017
4
Los Gatos, CA
Thank you for your guidance. I'll retest tonight and update. Do you suggest reducing the chorine level with a removal additive, then reintroduce chlorine using liquid?



Those pucks are what is driving up your CYA. Only use liquid chlorine, aka bleach. You can purchase this from the pool $tore in 10% or 12.5% strengths, or from your local Walmart as regular laundry bleach at 8.25%. Just be sure that it is plain old bleach, no additives like scents, or 'splashless' thickeners.

Please have a read through Pool School, it will explain what we teach for a Trouble Free Pool:
Pool School

This will explain the terms we use here, as well as managing chemicals:
ABC's of Pool Water Chemistry

Recommended Levels

Recommended Pool Chemicals

How to Chlorinate Your Pool

Chlorine CYA Chart

Pool Calculator Instructions

Ask any questions you may have, we love questions! :D

Nice to have you here with us.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
41,195
Tucson, AZ
There is no need to try to actively lower the FC level, it will drop pretty quickly on its own.
Depending on how high the CYA actually is, your FC may not even be really high.

Regardless, you are at a point where you need to replace water to get the CYA down. I may not even bother with testing anything again until after you replace 50% of the water and then see where your CYA level is. You might have to do that a couple times and then follow the SLAM to clear up the algae.
 

kevinshima

New member
Mar 5, 2017
4
Los Gatos, CA
OK, will replace at least 50% next weekend.
Latest readings:
Cl = orange (not dark orange anymore)
pH = 7.4 to 7.5
FC = 36.5
CC = 0
CH = 525
TA = 160
CYA = 200 (using 50% test method)
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
41,195
Tucson, AZ
Might need 2 50% drains if the CYA is that high. You could drain more if you know ground water is not a worry. I just did a full drain last weekend.
 

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