Over the 30+ years we lived in NW Houston, I realized that our pool water temp was approx the avg of daytime and nighttime temps. My personal minimum pool water swimming temp was 77 degrees. Not swimming at 76 degrees. Pretty much every year, the pool got too cold on my birthday, which is September 15th. That was about the last swim day of the season every year. Well, this year the pool, which we no longer own, apparently won’t get down to 77 degrees till the 20th or later. I don’t remember a year where it took that long to cool down. We had the pool installed in about 1983. This is a hot one for sure.

I was in Cancun last week the pools were bath water warm after noon time

Ocean was perfect

At about 6am ours will get as low as about 85 and at 6pm its usually about 94. I prefer to get in, in the morning, whereas my 5 and 7 year old prefer the afternoons. With that said, I usually work around the property in a swim suit on the weekends and when I get to hot, just hop in for a few minutes and get back to work.

I work on pools for a living and part of maintaining proper water balance is accounting for water temperature so I take the temperature of every pool that I I'm at. The lowest I've seen today is 82 degrees and the highest is 96. It has more to do with how much direct sunlight the pool gets and for how many hours per day then it does the outside temperature. My personal pool does not get much direct sunlight and I think it is in the low 80s right now but I haven't checked it since Sunday.

yeah, mine gets nearly direct sunlight all day and am blowing through chlorine like its going out of style. Its getting tough to keep up with.

I started running the pump at night instead of during the day to get it to cool down as much as possible. 10 pm to 10 am. It's made a 5 degree temp difference, which is a lot better then feeling like you're in the hot tub.

Check your stabilizer levels. If it's below 40 parts per million or above 200 parts per million it's going to be very difficult to keep chlorine in the water. Also make sure that your water is balanced. Out of balanced water will also give erratic results in other areas of water chemistry.

I bought one of those pool cleaning robots a few years ago and repurposed the Polaris pool cleaner port into an open-air radiator. I have the pool pump run for a few hours a day while the temp is coolest in the morning and then a regular daytime cycle and it stays around 88 degrees.

Genius

My pool, in full sun all day, for the last several years that I have data specifically on 9/15 (I have additional data, but it may be from the day before or day after since I don't always test every day)...

Water *Air
82    97
81    89
82    91

During the dead of Summer my pool is normally in the upper 80s. Today was 89, for example. The all-time high was 92 on several occasions.

* Can be misleading considering sometimes I test in the morning versus in the hot part of the day

Can you share how you rigged this up? I’ve been looking at doing this w/ a regular jet but I like the Polaris hookup better.

Please explain this, 40-200 ppm of what?
And please explain water balance to a pool newbie. Thanks

Cyanuric Acid - "stabilizer"



Free Chlorine
pH
Total Alkalinity
Calcium Hardness
Cyanuric Acid
...and more, but these are the key pieces. They need to be within particular ranges to have balanced water. Balanced water is safe for people, the equipment, and the pool itself. It also "looks" different. It's clear and sparkles more if that makes sense versus being cloudy, for example.


https://www.troublefreepool.com/blog/2018/12/12/abcs-of-pool-water-chemistry/
https://www.troublefreepool.com/blog/what-are-my-ideal-pool-levels/

I think the color of your pool plaster will have an effect on temps just like the direct sunlight. My last pool was a darker blue with lots of trees around it, and it got warmer than my current pool which is a lighter blue color with no shade or trees around. Our temps range pretty regularly from 85-90 with full sun all day in these temps. Last pool would get up to 94-95*.

PPM is an acronym for parts per million.

Water is balanced when it is neither prone to corroding away anything that is in it or leaving deposits on the pool surfaces. You have to balance total alkalinity, pH, and calcium hardness against one another and the temperature of the water. Since you can normally not change the amount of calcium in the water I usually do my calculations based around that. I then check my alkalinity levels which can be adjusted easily and the water temperature of the pool. From there I can calculate the ideal PH for the water to be balanced. If I find that it is balanced below 7.2 pH I will change other facets of water chemistry so I can run a safe pH and still have balanced water. The following is a calculator for the langolier saturation index. The majority of the pool industry uses this standard. There's also something else called The Hamilton index and it also works quite well. The langolier index was originally developed in the 1800s for Municipal Water Supplies and has been adopted for the pool industry. The Hamilton index was developed specifically for the pool industry.

https://www.lenntech.com/calculators/langelier/index/langelier.htm

My son`s pool is light blue and always stays pretty cool even though it gets lots of sunlight until about 5 pm. The water in it is never hot. I have no Idea water the temp is, but if he adds water from his well to it on a day we go swimming it will be pretty chilly when we get in. Not much swimming after Labor Day usually.

I capped off the hose end of the Polaris quick disconnect wall fitting and used PVC pipe, elbows, caps and a tee to make the sprayers that attach to the threaded part of the quick disconnect fitting. This way it can be easily removed whenever I want. Just twist and lock.

My pool has a mud bottom, fish, turtles, and snakes enjoy it too. The top is warmer than the bottom due to clarity, I need a really long snorkel.

I have a really long... oh, never mind.

Hottest part of the day, in direct sunlight, the floating pool thermometer shows 89-90. Not terrible, but I wait until after 4pmto get in after the neighbors' huge oak tree starts shading that end of the pool.

No concerns about pressure on the pump?

No. That particular return line has a jandy valve to regulate pressure.