There are two kinds of pool owners.
The first kind runs out of chlorine on a Friday night with 12 people coming over Saturday. Their pool brush lost half its bristles two summers ago. They can’t remember when they last replaced the vacuum head. The test strips in the drawer expired last year. Somewhere in the shed, buried under a pool cover, is what they think might be shock, but they’re not sure.
The second kind has everything organized. They know what’s in stock, what’s running low, and what needs replacing. When something breaks, they have the part or the tool ready. When friends want to swim, the water is ready too.
The gap between the two isn’t more money or more time. It’s a plan. And that plan starts with knowing exactly what pool supplies you actually need to have on hand.
This guide covers the essential supplies every pool owner should keep stocked, organized by category. At the end, there’s a full checklist you can screenshot, bookmark, or print directly from your browser and check off in person at any of our showrooms.
Why Getting Ahead of Your Pool Supplies Saves Money
Reactive pool ownership is expensive. When you run out of chlorine mid-season, you pay full retail at whatever store is closest. When your brush finally gives up, you replace it in a rush without comparing options. When a small leak turns into a big one because you didn’t have a patch kit, you’re looking at draining and refilling the pool.
Owners who stock up in the off-season, buy in appropriate quantities, and replace worn tools before they fail spend meaningfully less over the life of the pool than owners who buy in emergencies. The same $600 in annual chemical costs can be $900 for the reactive owner and $450 for the organized one.
The framework below is what actually keeps a pool running well without draining your wallet.
What Every Pool Owner Actually Needs
Break your pool supplies into six categories. Every category matters. Skip one and something eventually breaks.
Water Testing Supplies
Everything else depends on knowing your water chemistry. Without a test result, you’re guessing at what to add and how much.
Every pool owner needs a way to test:
- Free chlorine (target: 1 to 3 ppm) or bromine (target: 2 to 4 ppm)
- pH (target: 7.2 to 7.6)
- Total alkalinity (target: 80 to 120 ppm)
- Calcium hardness (target: 200 to 400 ppm)
- Cyanuric acid / stabilizer (target: 30 to 50 ppm for outdoor pools using chlorine)
Test strips are the easiest and most affordable option for weekly checks. A liquid test kit (drop-based) gives more precise readings for monthly or seasonal deep-checks. Owners who want the most accuracy invest in a digital tester that reads to the second decimal.
Bring a water sample to any of our showrooms and we’ll test it professionally for free. Free water testing is one of the most-used services at our locations and takes about five minutes.
Sanitizers and Chemistry
Sanitizers keep the water safe to swim in. Chemistry balancers keep the sanitizer working properly.
Sanitizers. Chlorine is the most common choice. It comes in three main forms: tablets (also called pucks) that dissolve slowly in a floater or automatic chlorinator, granular chlorine for quick treatment, and liquid chlorine for shocking or high-volume dosing. Bromine is an alternative that works well for pools that run warm and for hot tub owners who prefer its softer feel. Salt water systems (which still use chlorine, just generated on-site from salt) are increasingly common in newer above-ground pool setups.
pH adjusters. Sodium bicarbonate (baking soda) raises alkalinity. Muriatic acid or dry acid lowers pH when it climbs too high. Sodium carbonate raises pH when it drops too low.
Shock treatment. Pool shock is a stronger dose of oxidizer that kills algae, clears cloudy water, and eliminates contaminants that regular sanitizer can’t handle. The general rule is two pounds of shock per 10,000 gallons of water. Most pool owners underestimate how much shock they’ll go through in a season. Buy extra in the off-season.
Water hardness adjuster. Depending on your local water quality, you may need a hardness increaser (for soft water) or a scale controller (for hard water). Water tests reveal which category you’re in.
Algaecide. Preventative use during warmer months keeps algae from establishing in the first place. Curative use handles green, yellow, or black algae once it appears.
Cleaning Tools
The physical work of pool cleaning falls to a few key tools. All of them wear out over time and all of them should be inspected at the start of every season.
- Pool skimmer net. For clearing leaves, bugs, and debris from the water surface daily.
- Pool brush. For scrubbing walls, floor, and tile. The bristles wear down over 2 to 3 seasons and lose effectiveness before they look worn.
- Pool vacuum. Manual vacuum heads with hose attachments are the affordable standard. Automatic robotic cleaners (from brands like Hayward) do the work for you.
- Telescoping pole. The universal handle that connects to your skimmer, brush, and vacuum head. Check for corrosion and locking mechanism wear each spring.
- Leaf net or bag. Larger-capacity option for heavy debris after storms or in fall.
- Tile brush. For scrubbing the waterline where scale and body oils build up.
Equipment and Spare Parts
Your pool equipment does the invisible work of keeping water moving, filtered, and heated. Small failures cascade fast if you don’t have replacement parts.
- Filter cartridge or DE grid replacement. Depending on your filter type. Cartridges typically last 1 to 2 years; DE grids last 3 to 5.
- O-rings and gaskets. For your pump, filter, and equipment pad. Cheap to stock, expensive to be without when one fails.
- Skimmer basket. The plastic basket inside the pool skimmer that catches leaves. They crack over time from UV and freeze cycles.
- Pump basket. Same idea, protects the pump impeller.
- Chlorine dispenser or floating chlorinator. For pools using tablet chlorine.
- Pool light bulbs. If you have underwater lighting.
Gary’s carries the full lineup of Hayward pool products, including pumps, filters, heaters, motors, heat pumps, automatic cleaners, exterior lighting, automation controls, and salt water chlorine generators. If you own a Hayward system, we have your replacement parts in stock.
Safety Gear
The category most pool owners skip. Every pool needs a small set of safety and handling gear, especially for owners who handle their own chemistry.
- Chemical-resistant gloves. For handling chlorine, muriatic acid, and shock. Standard household gloves aren’t enough.
- Protective eyewear. For pouring or measuring chemicals.
- A dry, ventilated storage area. Chemicals shouldn’t sit in a hot garage or shed together. Some are incompatible and can react if they contact each other.
- Life ring or safety hook. Required by code in some areas and smart to have regardless.
- First aid kit. Kept near the pool, not just inside the house.
Emergency Repair Supplies
The category everyone forgets until they need it.
- Pool patch kit. A set of adhesive, waterproof patches for vinyl liners. When a small leak forms (and eventually one will), you patch it fast before it becomes a bigger problem. These kits are inexpensive and last for years unopened.
- Sealant or plumber’s tape. For tightening threaded connections that develop drips.
- Spare skimmer weir. The little flap in the skimmer that adjusts water flow. Cracks over time.
- Bucket, sponge, and rags. For quick spills, chemical measuring, and equipment work.
The Complete Pool Supplies Checklist
Screenshot this section, bookmark this page, or print it directly from your browser (Ctrl+P on desktop, Share → Print on mobile). Bring it to any of our showrooms and we’ll help you stock what you’re missing. If you’re not sure what you already have on hand, use this as your inventory audit at the start of every season.
Water Testing
Test strips (chlorine, pH, alkalinity, hardness, cyanuric acid)
Liquid drop test kit (backup or precision testing)
Digital tester (optional but preferred)
Sanitizers
Chlorine tablets or pucks (or bromine equivalent)
Granular chlorine (for quick dosing)
Liquid chlorine (for shock or heavy dosing)
Chlorine floating dispenser or automatic chlorinator
Chemistry Balancers
Sodium bicarbonate (alkalinity increaser)
Sodium carbonate (pH increaser)
Muriatic acid or dry acid (pH decreaser)
Calcium hardness adjuster
Cyanuric acid / stabilizer
Shock and Algae Control
Pool shock (2 lbs per 10,000 gallons, buy extra)
Preventative algaecide
Curative algaecide (for spot treatment)
Cleaning Tools
Pool skimmer net
Pool brush (replace every 2 to 3 seasons)
Pool vacuum head (manual or robotic)
Telescoping pole
Leaf net or bag (for storms and fall)
Tile brush
Equipment Spare Parts
Filter cartridge or DE grid replacement
O-rings and gaskets for pump and filter
Replacement skimmer basket
Replacement pump basket
Pool light bulbs (if applicable)
Safety Gear
Chemical-resistant gloves
Protective eyewear
Life ring or safety hook
First aid kit for poolside
Emergency Repair
Pool patch kit
Sealant or plumber’s tape
Spare skimmer weir
Bucket, sponge, and rags
When to Stock Up
Timing matters. The two smart windows for stocking pool supplies:
Late fall or winter. Off-season pricing on chemicals, tools, and equipment parts is significantly better than mid-summer retail. Buy your season’s supply of chlorine, shock, and pH balancers when everyone else has forgotten about their pools. Store in a dry, ventilated space away from direct heat.
Early spring, before opening. Do your inventory audit against the checklist above. Replace anything that’s worn (brush, vacuum head, telescoping pole locks, skimmer weir), restock anything that’s low, and confirm test strips or reagents haven’t expired.
By the time your pool is opened and the water is balanced, you should be running on inventory that lasts most of the season.
What NOT to Buy
Almost as important as what to stock is what to skip.
Cheap generic chlorine tablets. They dissolve too fast, contain fillers that gum up your equipment, and often lack cyanuric acid stabilization. Stick with quality trichlor tablets from established brands.
Multi-function chemical tablets. They sound convenient but usually contain shock, sanitizer, algaecide, and pH balancer in fixed ratios that rarely match what your pool actually needs. Buy each chemical separately and dose based on test results.
More brushes than you need. One good brush handles most pools. A backup is smart. Three or four is inventory hoarding.
Copper-based algaecides. Cheaper but they can stain pool surfaces and hair. Stick with quaternary ammonium algaecides.
Test strips from three seasons ago. They expire. Old strips give inaccurate readings, which lead to wrong chemical doses, which cost you more than a new pack of strips would have.
Frequently Asked Questions
How often should I test my pool water?
Twice a week during heavy use months (June through August). Once a week in shoulder seasons. Bring a sample to Gary’s for a full professional test at the start of every season and again mid-summer for a deeper analysis.
How much do pool supplies cost per year?
Wide range depending on pool size and use. A well-maintained above-ground pool typically runs $400 to $800 per year in chemicals and consumables. In-ground pools run $600 to $1,200. Buying in the off-season and staying on top of chemistry (which prevents costly problems) keeps costs at the lower end.
Where should I store pool chemicals?
Cool, dry, ventilated, and out of direct sunlight. Away from heat sources, gasoline, or other pool chemicals that aren’t compatible with each other. Original containers, tightly sealed. Never mix chemicals unless a label specifically says to.
Can I use hot tub chemicals in my pool (or vice versa)?
Some overlap (like calcium chloride for hardness), but many don’t. Pool shock is not the same as hot tub shock. Sanitizer concentrations differ. When in doubt, use the product designed for the water type.
Do I really need a pool patch kit if I have a fiberglass or concrete pool?
Patch kits are specifically for vinyl liner pools. If you have fiberglass or concrete, skip the vinyl patch kit and instead keep aquatic sealant or professional repair contact info on hand for the rare crack or chip.
How long do pool chemicals last in storage?
Chlorine tablets: 3 to 5 years unopened. Granular chlorine: 3 to 5 years. Liquid chlorine: 3 to 6 months (it degrades). Shock: 5+ years. Test strips: 1 to 2 years (check expiration). pH adjusters: 2 to 3 years.
Is a robotic pool cleaner worth it?
For most homeowners, yes. A quality robotic cleaner from a brand like Hayward saves 30 to 60 minutes of weekly manual vacuuming. Over a full season, that adds up. Pays back the investment in 2 to 3 seasons for most owners.
What’s the biggest pool supply mistake first-time owners make?
Buying reactively instead of proactively. Running out of chlorine on a Saturday. Discovering the brush is worn when the walls need cleaning. Realizing the pump gasket failed only when water is spraying out. The checklist above prevents most of these mistakes for the price of a single Saturday of preparation.
Bringing It Together
You don’t need every item on the checklist to enjoy your pool. But the difference between a pool owner who has what they need and one who doesn’t shows up in dozens of small moments across a summer. Water that’s clean when guests arrive. Equipment that works when you fire it up. Repairs that don’t turn into disasters.
The framework is simple. Test your water regularly. Stock the essentials in the off-season. Keep safety gear where you can grab it. Have a patch kit and a few spare parts ready before you need them. Replace worn tools before they fail.
Do that and pool ownership feels manageable instead of stressful.
Come stock up in person. Gary’s carries a full range of pool supplies, chemicals, cleaning equipment, and Hayward pool products at every location. Bring the checklist above (or a screenshot on your phone) and our team will help you fill any gaps. And bring a water sample while you’re at it. We’ll test it for free and give you exact recommendations for what your pool needs right now.
Locations: Amherst, Cheektowaga, Clarence (NY) and Matthews (Charlotte NC).
