Hi. Welcome.
We have lots of threads on pool closing. I don't know if any of us uses one of those kits.
Here's what I use to close my pool:
1) chlorine, preferably bleach/liquid chlorine.
2) Polyquat 60% (1 quart).
3) Test kit: Taylor K-2006 or equivalent
4) Plugs for returns and drains
5) "Gizmo", Aquador, or lots of foam for skimmer.
6) Silicone lube for O-rings.
7) snack or sandwich size ziploc bags. Sharpie to mark bags.
8) Cover (optional)
Other than the chlorine and the polyquat, you'll use everything else every year.
Steps I take after water gets to 60deg F (65 deg, max):
1) Test pool water. Need to know FC, pH, and CYA levels. T/A and CH are irrelevant. Adjust pH to 7.2-7.8
2) Add chlorine to proper shock level for CYA level. Keep it there for at least 24 hours.
3) Add Polyquat (I use 1 quart for my 19/20k pool). Wait 48 hours. Polyquat drives FC down.
4) Test FC. Add sufficient chlorine to raise FC back to shock level.
5) Backwash filter (sand or DE) and use backwash to pump water down. I like to be below returns, but if you only have a skimmer, you can use a siphon to lower the water sufficiently.
6) Remove plumbing. Every quick-connect needs to be opened, the O-ring dried and lubed, and put into a marked zip-lock.
7) Drain plumbing, store. Store O-rings indoors.
8) Drain filter completely. DE or cart filter should be stored indoors. Sand filter--leave drain off, remove multivalve (treat O-ring as above) and store indoors. Cover sand filter in contractor plastic bag. I use duct tape around the curves to hold the bag tight, but don't let the tape get on the tank. Drain and disconnect pump. Store indoors, like a warm basement.
9) plug return(s), drain(s) and skimmer gets Aquador, Gizmo or stuffed with foam rubber. All three are meant to prevent a slug of ice forming and splitting it.
10) Cover pool. Optional. Some member winterize their pool without a cover, like Watermom.
Total consumable expenses are bleach (chlorine), Polyquat, test reagents, and silicone lube. The rest are non-consumable.
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