Hayward Pro-Series Sand Filter Replacement: A Pool Owner's Guide

The Hayward Pro-Series sand filter has been a staple of in-ground pool installations for decades. It's built tough, it's easy to maintain, and sand is one of the most forgiving filter media available. But even the Pro-Series eventually reaches the end of its useful life — and when it does, you'll want to know your options before reflexively ordering the same model at OEM prices.

Signs Your Hayward Pro-Series Is Due for Replacement

Sand filters tend to degrade gradually, which means pool owners sometimes wait longer than they should before replacing them. Here's what to watch for:

Tank cracking or leaking. This is the clearest sign. If the tank body shows visible cracks or you're losing water from the tank itself (not from a valve or fitting), it's time for a new unit. Tank repairs are rarely practical.

Multi-port valve problems. The multi-port valve (the 6-position selector on top or side of the tank) is the most failure-prone component on a sand filter. O-rings wear out, handles break, and internal discs crack. If the valve is leaking or not routing water correctly, you have a choice: replace the valve alone, or use it as an opportunity to replace the whole filter.

Consistently high filter pressure. If your PSI gauge is always high even after backwashing, the laterals (the internal distribution arms at the bottom of the tank) may be broken, allowing sand to bypass the filter and clog your lines.

Sand in the pool return. Sand coming out of your return jets almost always means a cracked lateral. You can replace laterals individually — but if the tank is also aging, it makes more sense to replace everything at once.

Sand that's never been changed. Sand media should be replaced every 5–7 years under normal conditions. Old sand develops channeling (water finds easy paths through the media rather than filtering through it uniformly), dramatically reducing filtration effectiveness. If the sand is ancient, a full filter replacement may be more cost-effective than a tank cleaning and re-sand.

What to Match When Replacing

Before ordering a replacement, nail down these specs:

Tank diameter. Hayward Pro-Series comes in several sizes, typically measured by tank diameter: 16", 19", 22", 24", 27", and 30". Larger tanks hold more sand and filter more water per cycle. Your replacement should match your pool's GPM needs.

Sand capacity. Tied to tank size — the larger the tank, the more sand it holds. This matters because it determines how often you need to backwash.

Flow rate (GPM). Match your filter's rated GPM to your pump's output. An oversized pump pushing water through an undersized filter means high pressure, reduced filtration, and shortened equipment life.

Multi-port valve connection. Note whether your current multi-port valve is top-mount or side-mount, and what size the plumbing ports are (most residential models use 1.5" or 2"). If you're keeping the old valve, the new tank needs to accept it.

Hayward vs. the Alternatives: An Honest Look

The Hayward Pro-Series earns its reputation — but there's a strong case for considering alternatives when it's time to replace:

Price. OEM Hayward Pro-Series filters are priced at a premium relative to comparable products. The filtration physics of a sand filter don't change from brand to brand — a quality alternative tank with similar dimensions and flow ratings does the same job.

Warranty. Some alternatives carry 3-year warranties that are competitive with or better than what Hayward offers on replacement units.

Sand compatibility. Any quality sand filter uses standard #20 silica sand (or zeolite as an alternative media). You're not locked into proprietary media with any reputable sand filter brand.

Made in USA. Hayward manufactures overseas. If American-made equipment matters to you, there are quality domestic alternatives.

PST's Recommendation: Genesis Sand Filters

At PST Pool Supplies, we recommend Genesis sand filters as our go-to alternative for pool owners replacing a Hayward Pro-Series. Here's what we stock and why each one is worth considering:

Genesis 26" Oval Sand Filter (GPFS02629) — Our most popular standalone replacement for in-ground Pro-Series filters. The oval tank design is a smart engineering choice: it provides a larger filter surface area and increased sand capacity compared to round tanks of similar height, which means longer intervals between backwashing. The included 1.5" multi-port valve makes it a drop-in choice for most existing Hayward plumbing.

Genesis 22" Sand Filter with 2 HP Pump Bundle (GP52053473S) — If your Pro-Series pump is also showing its age, this matched bundle takes the guesswork out of pairing flow rates. The 22" tank is appropriately sized for mid-to-larger residential pools, and the 2 HP pump is more than capable of pushing water through the system at the rated GPM.

Genesis 19" Sand Filter with 1 HP Pump Bundle (GP52053373S) — For smaller pools or pool owners replacing a 16" or 19" Pro-Series, this bundle delivers complete filtration without the cost of an oversized system. The 1 HP pump is energy-efficient and well-matched to the 19" tank's flow specifications.

All three options ship with a 3-year warranty and Made-in-USA quality. Each tank accepts standard #20 silica sand or zeolite media.

A Note on Media: Sand vs. Zeolite

When you replace a sand filter, you have to fill it with fresh media. Standard #20 silica sand works perfectly and is the most affordable option. But zeolite — a naturally occurring mineral — is worth considering as an upgrade. Zeolite filters particles down to 2–5 microns (versus 20–40 microns for sand), doesn't require replacement as often, and uses less water during backwashing. It costs more per bag, but performs noticeably better on water clarity.

Both media work with any quality sand filter tank, including all three Genesis models above.

Installation Overview

Replacing a sand filter is a manageable afternoon project for most pool owners:

1. Turn off the pump and release pressure from the system using the air relief valve on the filter.
2. Disconnect the plumbing at the multi-port valve's pump port and return port.
3. Remove the old multi-port valve if you're reusing it (unbolt or unscrew depending on model).
4. Remove the old tank. Sand filters are heavy — drain as much water as possible first, and have help moving it.
5. Install the new tank on the equipment pad, connect the multi-port valve, and reconnect plumbing.
6. Add fresh sand media per the tank's specifications (usually listed on the label).
7. Run a rinse cycle on the multi-port valve before switching to filter mode to remove fine sand dust.
8. Check for leaks, then return to normal operation.

The most common mistake: skipping the rinse cycle. Always rinse before filtering, or you'll blow fine sand into your pool.

Bottom Line

The Hayward Pro-Series is a solid filter that's served millions of pools well. When it's time to replace it, you're not obligated to stay with Hayward — or to pay OEM prices. Genesis sand filters from PST Pool Supplies deliver the same low-maintenance filtration performance with USA manufacturing, a 3-year warranty, and a price that leaves money in your pocket.

Explore our sand filter options at pstpoolsupplies.com, or contact us for help matching the right filter size to your pump and pool volume.