Pool Supply Store in Franklin Square, NY
Nassau County Hard Water Meets Its Match Here
Swimming Pool Chemicals Franklin Square, NY
Most Franklin Square homeowners don’t have a chemistry problem — they have an information problem. They’re buying the wrong products for their water, using the right products in the wrong order, or relying on advice from someone who’s never actually worked on a Long Island pool. That gap between what’s on the shelf and what your pool actually needs is exactly where things go sideways.
Nassau County’s water supply draws from the Long Island aquifer system, which runs naturally high in calcium and minerals. That hard water chemistry creates specific challenges — scale buildup on your liner and equipment, pH that won’t hold, and calcium hardness that creeps up faster than you’d expect. The generic chlorine tablets from a warehouse store aren’t formulated for this. They’re formulated to move volume.
When you come to JAS Aquatics, you’re not guessing. You bring a water sample, we test it for free, and you walk out knowing exactly what your pool needs — not a cart full of products you may or may not use. Pool season in Franklin Square runs roughly from late April through early October. That’s a short window. You don’t have weeks to troubleshoot a green pool or a cloudy one. Get it right the first time, and enjoy the whole season.
Local Pool Equipment Store Franklin Square, NY
JAS Aquatics has been designing and building custom inground pools across Nassau County since 2009, including plenty of projects right here in Franklin Square. That’s not a marketing angle — it’s just context for why the advice you get here is different. When a team member recommends a product or walks you through a chemical issue, they’re drawing on 15-plus years of actually working on pools in this region, in this climate, with this water.
Our retail store at 454 East Jericho Turnpike in Huntington Station carries pool supplies, equipment, chemicals, covers, and everything else you need to keep your pool running from opening day to closing day. Because we also handle pool construction, renovation, and maintenance, we understand the full picture — not just the chemical aisle.
Franklin Square homeowners have trusted JAS Aquatics for years. Whether you’re on a street off Hempstead Turnpike maintaining a 1960s-era inground or you’ve got an above-ground in the backyard of a home you bought three years ago, the answer is the same: come in, bring a water sample, and get a straight answer from someone who knows Long Island pools.
Pool Water Testing Franklin Square, NY
It starts with your water. Bring a sample into the store — ideally collected from about 18 inches below the surface — and our team will run a full test on the spot. That means pH, alkalinity, calcium hardness, chlorine level, and stabilizer. No charge. No appointment needed. The result isn’t a printout pointing you toward the most expensive products on the shelf. It’s a clear, honest breakdown of what your water actually needs.
From there, you get specific product recommendations with straightforward instructions on how to use them. If your pool has a known issue — algae, cloudy water, scaling on the liner — we’ll walk you through the treatment sequence so you’re not just throwing chemicals at a problem and hoping something works. That step-by-step guidance matters, especially early in the season when Franklin Square pools are coming out of a Nassau County winter and the water chemistry is starting from scratch.
If your pool needs more than chemicals — a replacement pump, a new filter, a winter cover that meets Town of Hempstead’s safety requirements — that’s all available in-store too. The goal every time is simple: you leave with exactly what you need, nothing you don’t, and a clear plan for getting your pool back to where it should be.
Ready to get started?
Pool Pumps, Filters, and Supplies Franklin Square, NY
We carry a full range of pool supplies built for Long Island conditions — not a curated selection of whatever moves fastest at a national chain. Our swimming pool chemicals are professional-grade and full-concentration, which matters when you’re dealing with Nassau County’s hard water and a pool season that demands consistent chemical balance from May through October.
For above-ground pool owners — and there are plenty in Franklin Square, where lot sizes make above-ground pools a practical and popular choice — we stock replacement liners, compatible pumps and filters, above-ground pool parts, and everything needed to keep those systems running properly. Nassau County requires above-ground pools to have a minimum 48-inch fence with self-closing, self-latching gates, and the pool must sit at least 10 feet from any property line. If you’re navigating those requirements, our team can help you understand what compliant safety products look like.
For inground pool owners, we carry liquid pool chlorine, pool covers for sale including winter safety covers, replacement pool liners, pool pumps and filters, pool accessories, and seasonal products for both opening and closing. The Town of Hempstead requires pool fences to be at least five feet high — exceeding the state’s four-foot standard — so if you’re replacing or adding a barrier, that local spec matters. Whatever stage of the season you’re in, the inventory and the expertise are here.
What pool chemicals do I actually need to open my Franklin Square pool?
Opening a pool in Franklin Square after a Nassau County winter means starting your water chemistry essentially from scratch. The sequence matters more than most people realize. You’ll typically need a shock treatment first to oxidize any buildup from the winter, followed by an algaecide to prevent early-season growth, and then a full chemical balance — pH adjuster, alkalinity increaser or decreaser depending on where your levels land, calcium hardness treatment, and stabilizer to protect your chlorine from breaking down in the sun.
Because Nassau County water is naturally high in minerals, calcium hardness is almost always a concern at opening. If you skip that step, you’ll fight scale buildup on your liner and equipment all season. The most reliable way to know exactly what your Franklin Square pool needs is to bring a water sample in for a free test before you buy anything. That way you’re not guessing — and you’re not buying products your water doesn’t need.
How often should I be testing my pool water during the summer?
During active swimming season, testing your pool water at least once a week is a reasonable baseline. But Long Island summers — hot, humid, and heavy with swimmer traffic on weekends — can push your chemical levels out of range faster than that. If you’ve had a stretch of 90-degree days, a pool party, or a significant rainstorm, test before and after. Rain in particular can throw off your pH and dilute your sanitizer levels more than people expect.
Our free in-store water testing at JAS Aquatics is there for exactly these moments. A quick test every few weeks throughout the season, especially if something looks off — cloudiness, an unusual smell, or water that’s starting to go green around the steps — can catch a problem before it becomes a full treatment situation. Consistent testing is genuinely the cheapest form of pool maintenance there is.
Do I need a permit for an above-ground pool in Franklin Square, NY?
Yes. Nassau County requires a permit for above-ground pool installation, and the Town of Hempstead — which governs Franklin Square — has specific requirements that go beyond the state standard. Your above-ground pool needs a fence at least 48 inches high with self-closing, self-latching gates, and the pool itself must be located at least 10 feet from any property line. Skipping the permit process can result in fines and potentially having to remove the pool entirely, so it’s worth handling upfront.
If you’re unsure what compliance looks like for your specific setup, our team has been working within Nassau County’s regulatory environment for over 15 years and can point you toward the right safety products and barrier systems. Getting the permit right the first time saves a significant amount of hassle down the road.
Why does my pool water keep going cloudy even after I add chemicals?
Cloudy water after chemical treatment is one of the most common frustrations pool owners bring into the store, and it almost always comes down to one of three things: the chemicals were added in the wrong order, the water chemistry was out of balance before treatment started, or the filtration system isn’t running long enough to clear the water after treatment.
In Franklin Square specifically, high calcium hardness — a natural result of drawing water from the Long Island aquifer system — can cause cloudiness that looks like a chemical problem but is actually a water hardness issue. If your calcium hardness is too high, adding more chlorine won’t fix it. A free water test will tell you exactly which parameter is off, and from there the fix is usually straightforward. Running your filter for at least 8 to 10 hours after any chemical treatment also makes a significant difference in how quickly the water clears.
What's the difference between the pool chemicals here and what I'd buy at a big-box store?
The most significant difference is concentration. Professional-grade pool chemicals — the kind we stock at JAS Aquatics — are formulated at full strength. Many of the products sold at large national retailers are lower-concentration versions of the same chemicals, which means you end up using more product to get the same result. Over a full season, that adds up — both in cost and in the time you spend re-treating.
There’s also a formulation consideration specific to Long Island water. Nassau County’s hard water creates conditions that not every generic chemical is designed to handle effectively. Products that work well in softer water markets may underperform here. We select products based on what actually works in this region, with this water chemistry — not based on what’s easiest to stock in bulk. That difference shows up in your pool, and most people notice it within the first treatment.
When should I start thinking about closing my Franklin Square pool for the winter?
The general rule for Long Island is to close your pool when the water temperature consistently drops below 60 degrees — typically late September into early October for Franklin Square. Closing too early while the water is still warm can lead to algae growth under the cover over the winter. Waiting too long risks freezing temperatures damaging your equipment, cracking your pump, or causing liner issues that are expensive to fix in the spring.
A proper closing in Nassau County means balancing your water chemistry before you cover the pool, adding a winter algaecide and shock, blowing out the lines, and using a winter cover that meets the Town of Hempstead’s safety requirements — which mandate a fence at least five feet high around the pool area. We carry everything needed for a complete pool closing, and our team can walk you through the right sequence for your specific pool type so you’re not dealing with preventable problems when opening day comes back around.
Local Resources
Useful Links
Other Services we provide in Franklin Square