Is polyquat 60 absolutely necessary for closing?


Active member
Apr 19, 2017
Hillsborough New Jersey
Have to close early this year, mid September in NJ. I forgot last year to add polyquat 60 to pool. It still opened crystal clear. Solid cover and closed mid October then. I’m wondering how important is the addition of polyquat to the process? BTW just a thanks to all that make this site available, 15 yrs struggling to keep my pool clear, 4 yrs with TFP and nary a struggle had. Thanks.
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Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
As you found Polyquat 60 is not essential in a pool closing. Using it is an insurance policy against possibly having algae at opening. It may help, it may not, and you may get by without it.


Well-known member
Jun 16, 2019
Compare the cost of using it versus the *possible* cost of a SLAM in the spring. I personally like the $30 piece of mind. I seem to be in the minority but when I built my pool, I factored and budgeted the yearly operating costs beforehand. Some years are better than others, but It wouldn’t have been any different if we bought a boat instead. I like to save money as much as the next guy, but a handful of $30 ‘insurance policies’ is a drop in the proverbial bucket.


Gold Supporter
Jun 18, 2014
Glassboro, NJ
I use POLY in my steps (2 are weights w/ gravel) to prevent algae. Try to change every week or two weeks. I have almost a whole bottle left I'll just dump the whole thing in the night before closing and let the pump run all night.


Mod Squad
Gold Supporter
Platinum Supporter
LifeTime Supporter
Jul 16, 2012
Central MD
I would recommend adding it since you are closing with the water temperature being above 60. You may still have a green pool at opening, but closing this early you need all the (safe) help you can get.


Gold Supporter
TFP Guide
Jun 8, 2019
Milwaukee, WI
I'm going to do it this year when I close for the first time, but I have a mesh cover and worry about algae blooming since it won't block all sunlight.


Platinum Supporter
TFP Guide
Jul 30, 2014
Monmouth County, New Jersey
If you are going to close early with a mesh cover, then use Poly 60, but make sure the pool is clean first. If you want to have extra insurance, cover the mesh cover with inexpensive solid tarps (secure) and still allow some rain water in until December 1st, and then you can remove them until next year. This will keep most of the UV Rays away from the pool until it becomes real cold.