Just put water in my pool last Tuesday, so it has been a week. Currently I am adding a gallon of 10% chlorine a day to my pool with a CYA of 30. The pool gets direct sunlight all day long. Is there a recommended CYA level so I am not using quite so much chlorine each day? I am currently adding chlorine at night before sundown and it goes to 6 and by the same time next day it is 2 before adding more. Thanks.
Recommended CYA
- Thread starter brunnesa
- Start date
I've got the same size pool as you've got. Also, I'm in a similar situation. Pool is exposed to the sun from 8:30am until 6:30pm every day. Either the wife, my son, myself (or all three of us) use the pool every single afternoon. My CYA is currently holding around 40 and I'm adding between 60 and 100 oz of 10% chlorine every day. It's really clear water and most every time I test it in the evenings, FC reads about 1.5 or 2. But it's not incredibly expensive, just a little bit of time and effort.
You've got a stenner pump, so you don't need to leave room for CYA via pucks while you do out of town, so I'd target 50 CYA.
One gallon (128oz) of 10% bleach in a 13,500 gallon pool will add 7.4ppm to FC.
That is a very high chlorine demand. The two major contributors to FC demand in a swimming pool is UV (sunlight) and organics (algae, bather waste, etc).
To rule out Algae or other organic materials you should perform an Overnight Chlorine Loss Test. If you pass the OCLT, chances are that this is a UV issue, and should raise your CYA to see how much it will help. If you fail the OCLT, you should SLAM Process the pool.
I recommend you don't raise CYA until you confirm the pool passes an OCLT.
That is a very high chlorine demand. The two major contributors to FC demand in a swimming pool is UV (sunlight) and organics (algae, bather waste, etc).
To rule out Algae or other organic materials you should perform an Overnight Chlorine Loss Test. If you pass the OCLT, chances are that this is a UV issue, and should raise your CYA to see how much it will help. If you fail the OCLT, you should SLAM Process the pool.
I recommend you don't raise CYA until you confirm the pool passes an OCLT.
domct203, I thought of that so I tested it this morning. I lost 0 chlorine overnight. I really think the sun is just killing my chlorine.
Mendy48
Bronze Supporter
Maybe you need to increase your CYA to 40 or 50. I was having the same issue. I have direct sunlight and I was losing a lot of FC during the day. I've since increased my CYA to 50, and I've had no issues thus far.