When planning a backyard pool, most homeowners focus on things like size, shape, and how the space will look. But once the pool is in, maintenance becomes part of the day-to-day.
And while no pool is completely maintenance-free, fiberglass pools are generally one of the easier options to care for. They require less upkeep, fewer harsh chemicals, and less time compared to concrete or vinyl liner pools.
While some homeowners choose to hire a cleaning service, many find the routine simple enough to handle on their own.
So, what does fiberglass pool maintenance actually look like?
Here are the basics you’ll want to stay on top of to keep your water clean and your pool in great shape:
- Clean regularly with products made for fiberglass pools
- Check water chemistry
- Run the pool filter
- Keep the water level above the skimmer
Let’s walk through each of these so you know what to expect.
How do you clean a fiberglass pool?
Cleaning a fiberglass pool comes down to a few simple habits.
Using a pool cover when the pool isn’t in use can help cut down on debris and reduce how often you need to clean.
The smooth, nonporous gelcoat surface makes it harder for algae and dirt to stick, so brushing is usually less frequent than with other pool types. You’ll still want to regularly remove debris with a skimming net to keep the surface clear.
You may also want to use a pool vacuum from time to time to remove dirt that settles on the bottom. Depending on your setup, this could be a manual vacuum or an automatic cleaner.
If algae does show up, it can typically be handled with a standard chlorine shock treatment along with proper water balance.
Quick comparison: concrete pools have a porous plaster surface, which gives algae more places to cling. This usually means more frequent brushing, along with acid washing every 3-5 years and resurfacing about every 10-15 years.
Cleaning products for fiberglass pools
Fiberglass pools require a gentler approach when it comes to cleaning products and tools.
A soft brush, sponge, or cloth along with a mild pool-safe cleaner is usually all you need to remove dirt or buildup without damaging the gelcoat.
Harsh or abrasive cleaners should be avoided, as they can dull the surface over time and affect water chemistry.
Quick comparison: maintenance for a concrete pool includes steel brushing and acid washing. It's as hardcore as it sounds.
How to check you water chemistry?
Every pool needs balanced water chemistry. That means regularly checking and keeping an eye on these key levels:
- Chlorine
- pH
- Calcium hardness
- Cyanuric acid (CYA)
- Total alkalinity
Fiberglass pools don’t typically impact water chemistry as much as some other pool types, but you’ll still want to stay on top of regular testing and keep your levels within the recommended ranges.
If you’re looking for a deeper breakdown of what to test, target ranges, and how often, check out our full pool care guide.
Quick comparison: Concrete pools are alkaline-based and tend to raise pH over time, which means more frequent adjustments, often with regular acid use. Many homeowners choose a weekly service company to manage it.
How long to run your pool filter?
All pools need a filter system, but how long it runs can vary.
For most fiberglass pools, you’re typically aiming for about one full circulation per day. In practice, that usually works out to around 8–12 hours of runtime, depending on your pool size, filter, and usage.
You can estimate your ideal runtime using this formula:
pool volume ÷ filtration rate = hours to run the filter
For example, a 17,000-gallon pool with a filter rate of 2,400 gallons per hour would suggest around 7 hours, but many homeowners run their systems a bit longer to maintain consistent water clarity, especially during peak season.
Quick comparison: Concrete pools often run longer filtration cycles, sometimes up to two turnovers per day, which can increase energy use compared to fiberglass pools.
What's the right water level for your pool?
Your pool water level should stay around halfway to three-quarters up the skimmer opening to keep everything running properly.
It also helps maintain enough weight in the pool to counteract any upward pressure from groundwater.
(If you want to learn more about why that matters and the science behind it, check out our simple guide on hydrostatic pressure.)
If you ever need to drain your pool, don’t do it yourself, improper draining can cause serious damage, so it’s best handled by a pool professional.
Quick comparison: All inground pools rely on water weight to resist groundwater pressure. Concrete pools are heavier, but any pool can shift or float if it's drained improperly.
So, what maintenance does a fiberglass pool need?
When you break it down, fiberglass pool maintenance is about staying consistent with a few key habits, keeping the pool clean, monitoring your water chemistry, running the filter, and maintaining the proper water level.
None of these steps are complicated on their own, but they work together to keep your pool looking good and functioning the way it should.
Compared to other pool types, the process is typically more straightforward and may involve fewer adjustments over time.
With a routine in place, most homeowners find it manageable, and something that fits naturally into their day-to-day.
Frequently Asked Questions
How much maintenance does a fiberglass pool require?
Fiberglass pools are lower maintenance compared to other inground pools. Most homeowners just need to clean the surface, check water chemistry, run the filter, and maintain the proper water level. Because the surface is smooth and nonporous, it requires less effort and fewer chemicals than concrete or vinyl pools.
How do you clean a fiberglass pool?
Cleaning a fiberglass pool is simple. You can remove debris with a skimming net, vacuum the bottom as needed, and occasionally wipe surfaces with a gentle cleaner. Because the surface is not as prone to algae, it usually requires less brushing, and if algae does appear, a chlorine shock treatment typically clears it within 24 hours.
What chemicals are needed for a fiberglass pool?
Fiberglass pools use standard pool chemicals, including chlorine, pH balancers, calcium hardness, cyanuric acid (CYA), and total alkalinity. However, they typically need fewer adjustments because the surface doesn’t affect water chemistry like concrete pools do.
How long should you run a fiberglass pool filter each day?
The ideal run time is long enough to turn over your pool’s entire volume at least once per day, but ideally twice. For most residential pools, this means running the filter 8–12 hours daily, though this varies based on pump size and pool volume.
What is the proper water level for a fiberglass pool?
Your pool water level should stay around halfway to three-quarters up the skimmer opening to keep everything running properly. This helps maintain proper circulation and prevents issues caused by groundwater pressure. If you ever need to drain the pool, it’s best to consult a professional.
About the Author
Pool maintenance is one of those topics that tends to feel more complicated than it actually is, especially before you have a pool in your backyard.
I’m Cristian Shirilla, Marketing Manager at River Pools and co-owner of a fiberglass pool installation company in Virginia. I spend my time helping homeowners understand what pool ownership really looks like, from day-to-day care to long-term expectations.
I wrote this article to give you a clear picture of what maintaining a fiberglass pool actually involves, so you can go into the process with the right expectations and a plan that feels manageable.
From the Manufacturer
Taking care of your pool doesn’t have to feel overwhelming, especially when it comes to fiberglass. With the right routine, maintenance of a fiberglass pool is simple, straightforward, and designed to fit easily into your lifestyle.
At River Pools, we manufacture high-quality fiberglass pools installed by independent installers across North America. Our mission is to give homeowners the knowledge and tools they need to feel confident about pool ownership, from installation through long-term care.
If you’re still learning what it takes to maintain your pool, or just weighing your options, we’re here to help you every step of the way.
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