Drat. I never knew there was a distinction! Until now. :(
I also didn't know enough to even think to ask about a distinction.
In hindsight, I would have used long-radius elbows had I known of
their very existence, especially since I had tons of room:
It seems, upon looking just now at my original professionally
installed plumbing, that there were no long-radius elbows used:
That's odd, because there was plenty of room, so, I wonder why
the builders opted for short-radius elbows instead of the more
efficient longer-radius elbows (which can't possibly have cost
all that much more, can they?).
From my experience most pool installers are ambivalent about pool
hydraulics and if they end up having to much head, they just use a
bigger pump or tell you to run it longer.
They just go for a compact jumble of pipes that looks pretty.
There were several good web sites that had hydraulic calculators when
I was building my pool. (google pool hydraulics)
I ended up using 3" pipe with sweeps for the curves on the long trunk
runs, necking down to 2", then 1.5" at each return and minimized the
number of elbows in the "pack" area. I used 45s to get into the ground
and back out, That saves you the "price" of less than half of the head
calc vs a pair of 90s.
The end result was I could turn over a 15,000 gallon pool with 1hp
less than 5 hours. I get the spa turned over for free.
I spent another $50 on the bigger pipe but I got that back in
electrical savings pretty fast and my pump cruises at 4-5 PSI with a
Most of what that article says is either wrong or irrelevant
"The main reason for running the pool pump during the daylight hours
is to ensure proper sanitation. Chlorine is degraded by sunlight, so
there is a larger demand on the chlorine residual during the day."
Yes, some of the chlorine is going to be degraded by sunlight, but so
I've had my pool sit all day without circulating, checked the chlorine
there isn't a measurable difference. It's still at a perfectly
the same at 5PM as it was at 8AM. That's what stabilizer is for.
"When the pool pump is operating, the circulation in the pool
disperses the chlorine throughout the pool."
That's true, but dispersing it at night works about the same. And
once dispersed, it doesn't just change dramatically in 12 hours.
"Also, most pools use some type of chlorinator that adds chlorine only
when the pump is running."
I think that is flat out BS.
"By running the pump during the day, it helps keep the chlorine at a
I agree in theory, it would keep it more constant during the day. But
it's plenty constant enough with the pump off during the day. Absent
"Use of the pool also consumes the chlorine, and most swim during the
Again this apparently assumes you have an inline chlorinator.
"Having the proper levels of chlorine helps kill algae spores, germs,
bacteria and other contaminants as soon as they enter the pool. If the
chlorine level is too low, or not dispersed evenly throughout the
pool, it gives these "intruders" the possibility of gaining a toe-hold
and starting to grow. This can result in cloudy water, algae blooms
and even recreational water illnesses that can be transmitted between
Proper level of chlorine and filtering at night are not mutually
"Many pool owners are starting to install alternative methods of
chlorination and sanitation on their pools. These include salt
chlorination and ozone. The same rules apply to these as with
Which also appears to be irrelevant.
"The only way to make sure your pool is safe for bathers is using a
good quality test kit to make sure the water is properly sanitized,
says Steve Bludsworth, owner of All-Pool Service & Supply in Orlando."
That's about the only thing here I agree with.
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