First time closing: Do I need to purchase "winterization chemicals"?

bostonpool

Well-known member
May 29, 2017
80
Worcester, MA
We are closing our pool on MOnday. Our Pool Store guys are coming out to do it as I've never done it before.

They claim I need to purchase "Winterization chemicals" which include things like "Scale Inhibitors", etc.

I've got a 32,000 gallon Gunite pool and use a SWG. Have been using the Troublefree Pool method all season with no issues, other than perhaps I've let PH get a little to high now and then.

What are your thoughts on winterization chemicals? If you don't use them, what can I use in place?
 

Chemnut

In The Industry
Apr 5, 2017
231
Maine
The pool should be brought to shock levels a week before closing, give it a good vacuum, then close. I always add 1 lb mps plus. 1 jug of poly quat 60. IMO anything else they put in is a waste.
 

Catanzaro

Platinum Supporter
TFP Guide
Jul 30, 2014
3,403
Monmouth County, New Jersey
Most of us here on the forum do not use a winterizing kit. As chemnut mentioned, bring up to shock level and allow to drift back down. Use of PolyQuat 60 is optional, but I prefer it and recommend it. The algaecide will consume most of your chlorine if you do not allow the levels to come down. More importantly, open up early in the spring.

no issues, other than perhaps I've let PH get a little to high now and then.
SWG configurations most of the time, not always have rising PH issues as you have seen. You may have to lower your TA or shut off /minimize any aeration devices you may have in your pool. At a TA of around 70-90, my PH, even with the addition of the SWG in 2017 had steady PH. I even had rotating return jets that created aeration as well.
 

AftonJeeper

Bronze Supporter
May 11, 2017
1,151
Twin Cities, MN
No you do not need the "winterization chems". Technically you only need bleach/chlorine and bring it to slam level 2-3 days prior to closing, the day before if you know you will pass the OCLT. Polyquat 60 is an insurance policy and I would add it if your pool doesn't freeze or you have had issues in the past opening up to a green mess.

Pool School - Closing an In Ground Pool
 

bostonpool

Well-known member
May 29, 2017
80
Worcester, MA
SWG configurations most of the time, not always have rising PH issues as you have seen. You may have to lower your TA or shut off /minimize any aeration devices you may have in your pool. At a TA of around 70-90, my PH, even with the addition of the SWG in 2017 had steady PH. I even had rotating return jets that created aeration as well.
My TA was 90 at the beginning of the season, and got down below 60 in early SEpt. I had to add Baking Soda to get it back up to 60. Regardless of where my TA was, my PH would rise weekly. I typically had to add 1-2 quarts of acid per week.
 

Catanzaro

Platinum Supporter
TFP Guide
Jul 30, 2014
3,403
Monmouth County, New Jersey
My TA was 90 at the beginning of the season, and got down below 60 in early SEpt. I had to add Baking Soda to get it back up to 60. Regardless of where my TA was, my PH would rise weekly. I typically had to add 1-2 quarts of acid per week.
Borates may be your next step!