worried about brief polar vortex freeze this week

Liz70

Member
Apr 13, 2019
15
Ottawa Ontario Canada
Hi everyone!

We are planning to open our 21' above ground pool today. The weather here in Ottawa has been nice (about 60-70F) the past 9 days and we are starting to grow algae and the pool is getting green so I feel it should be done sooner than later.

The problem is, we are supposed to get 4 nights in a row beginning Thursday where the temps drop to -1c and -2c (about 28F) with day temps only about 40F.

Should we wait or if I run the pump 24/7 will it be ok? The current pool water temp is 12c (54F). I really want to get some chemicals in there and filtered. Thanks for any help you can give.
 

Donldson

TFP Expert
LifeTime Supporter
Jun 12, 2009
4,415
NW Ohio
Keep the pump running and you'll be fine. You'll be experiencing the equivalent of Southern Winter, the water won't freeze as a whole and running the pump prevents any small pockets of water in the plumbing or filter system from getting cold enough to solidify.
 

Liz70

Member
Apr 13, 2019
15
Ottawa Ontario Canada
Thanks Donldson. I would just be worried in case we had a power outage. But I suppose it would have to be a LONG power outage for the pipes etc to really freeze at those temps.
 

wayner

LifeTime Supporter
May 31, 2012
521
Toronto, ON
Hi everyone!

We are planning to open our 21' above ground pool today. The weather here in Ottawa has been nice (about 60-70F) the past 9 days and we are starting to grow algae and the pool is getting green so I feel it should be done sooner than later.

The problem is, we are supposed to get 4 nights in a row beginning Thursday where the temps drop to -1c and -2c (about 28F) with day temps only about 40F.

Should we wait or if I run the pump 24/7 will it be ok? The current pool water temp is 12c (54F). I really want to get some chemicals in there and filtered. Thanks for any help you can give.
I wouldn't be in haste to open the pool. So what if it gets algae? You just shock it and it clears up in a couple of days. Lots of peole don't open their pools until June, at that is in Southern Ontario where it is a few degrees warmer on average.
 

PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
4,687
Damascus, MD
You don't need to open the pool to treat the algae. Just throw in a gallon or so of bleach (chlorine) and mix it with your brush. Wait to turn on equipment until the freeze is over.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,067
Northern NJ
Read what conditions it takes to actually cause freezing. It takes more then a short dip in temperature.


Also you may find Preparing Pool for Cooler Months - Further Reading helpful.