The way you close your pool in the fall has a direct and significant effect on what you find when you open it in spring. A pool that was closed correctly — with proper chemical treatment, equipment protection, and a secure cover — opens cleanly in May or June and is swimming-ready within a day or two. A pool that was closed carelessly opens green, with scale buildup, potential equipment damage, and a recovery process that can take weeks.
For Rhode Island homeowners, pool closing isn’t optional or casual. The winters here are legitimately hard on pools. Freeze-thaw cycles, sustained cold, and ice formation inside pipes and equipment can cause serious and expensive damage if the system isn’t properly winterized.
Here’s what a proper pool closing in Rhode Island actually involves — and why getting it right is worth the attention.
Timing: When to Close in Rhode Island
The timing of your pool closing should be based on water temperature rather than calendar date. The general guideline is to close when water temperatures drop consistently below 60 degrees Fahrenheit — at that point, algae growth slows dramatically and the chemistry becomes more stable for the winter.
In Rhode Island, this typically happens in late September through mid-October depending on the year and location. Coastal properties often hold warmth a bit longer than inland ones. Closing too early while the water is still warm leaves more potential for algae development under the cover through fall. Closing too late risks equipment damage from early freezing temperatures.
If you’re not sure when to close, Pools Plus can advise based on your specific pool type and equipment.
Chemical Balancing Before You Close
Closing chemistry is the foundation of a good winter. The water needs to be in proper balance before the cover goes on — because whatever condition the water is in when you close is essentially the condition it will be in (and potentially amplify) through the winter months.
Before closing, the water should be tested and adjusted to reach:
- pH: 7.2 to 7.6
- Total alkalinity: 80 to 120 ppm
- Calcium hardness: 180 to 220 ppm
- Chlorine: Elevated slightly above the normal range for the winter
A closing chemical kit — typically including a pool shock, algaecide, stain and scale inhibitor, and winter enzyme product — is added after balancing. These chemicals work through the winter months to keep the water clear and protect surfaces and equipment from scale and organic buildup.
Pools Plus offers free in-store water testing and has the closing chemical supplies needed for any pool type. Getting the chemistry right before closing takes one or two hours and saves significant headaches in the spring.
Lowering the Water Level
Before closing, the water level needs to be dropped below the skimmer and return lines to prevent water from sitting in pipes where it can freeze and crack fittings, skimmer bodies, or return fittings.
The appropriate level depends on your pool type and cover system:
- For solid safety covers and winter covers, water is typically lowered 4 to 6 inches below the skimmer
- For mesh covers that allow some water through, the level is often dropped a bit more to account for precipitation
This step is important and non-negotiable in Rhode Island’s climate. Water left in skimmers and returns through a hard winter is one of the most common causes of costly spring repair bills.
Blowing Out and Plugging the Lines
After the water level is adjusted, all plumbing lines — main drain, skimmer lines, and return lines — need to be blown out with a compressor to remove residual water and then plugged with winter plugs or expansion plugs.
This is the step that most clearly requires professional experience or at minimum a careful understanding of your pool’s specific plumbing configuration. Missing a line or plugging in the wrong location can result in a cracked fitting or pipe by February.
Professional pool closing services from Pools Plus include a full line blowout and plug process by experienced technicians who know how to handle different plumbing configurations and catch anything that might be at risk.
Equipment Winterization
Every piece of equipment in your pool system needs to be properly prepared for winter:
Pump: Drain completely. Most pump housings have drain plugs specifically for this purpose. Water left in the pump housing will expand when it freezes and crack the housing — a repair that’s easily avoided.
Filter: Drain the filter tank completely. For sand filters, open the drain and remove the drain plug for the winter. For cartridge filters, remove and clean the cartridge and store it indoors.
Heater: Drain the heater and remove the drain plugs. Heater heat exchangers are among the most expensive pool components and among the most vulnerable to freeze damage.
Chemical feeders and chlorinators: Remove and clean. Store indoors or in a temperature-controlled space.
Pool lights: Leave in place but ensure the fittings are tight and properly sealed.
Covering the Pool
The winter cover is the last line of defense — it keeps debris out, limits sunlight (which would otherwise feed algae), and helps maintain the chemistry you worked to establish at closing.
Safety covers — mesh or solid covers anchored with straps and hardware — are the standard for inground pools in Rhode Island and are worth the investment if you don’t have one. They’re significantly more durable and effective than basic water bag covers, and they prevent accidental entry by children or animals during the winter months.
Make sure your cover is in good repair before installing it. A winter cover with significant holes or tears isn’t protecting your pool — it’s just decoration.
Let the Professionals Handle It
A proper pool closing in Rhode Island takes two to four hours and involves chemical work, equipment disassembly, line blowouts, and cover installation. For most homeowners, the time, the equipment needed, and the risk of missing something critical makes a professional closing service the right call.
Pools Plus pool closing services cover the full process — chemical balancing, water level adjustment, line blowout, equipment winterization, and cover installation — with the confidence that comes from a team that has done thousands of closings across Rhode Island. Book your closing before the fall schedule fills in.
