Upland · Open 7 days

Free water testing and pool supplies in Upland.

Bring a sample, leave with a plan.

GoogleSee Google reviews Since 1982In Upland C-53CSLB #1063945 CPOCertified · Insured PentairJandyHaywardWarranty center
At the store

What we do at the counter.

Free water testing

Bring a sample in a clean bottle, filled elbow-deep away from a return jet. We test chlorine, pH, alkalinity, calcium hardness, stabilizer, and salt, then write out what to add, how much, and in what order. No purchase needed.

Pool chemicals

Chlorine tabs, liquid chlorine, shock, acid, salt, balancers, stabilizer, algaecide, and clarifiers, with advice from people who service pools for a living.

Pool and spa supplies

Spa chemicals, filters, and covers alongside the pool aisle, plus test kits, brushes, poles, nets, and vacuum heads.

Pool equipment sales

Pumps, filters, heaters, salt systems, automation, and automatic cleaners sold at the counter. Buy it here and have our crew install it, or take it home. We're an authorized Pentair, Jandy, and Hayward warranty center, so warranty claims come back to the same counter.

Parts and special orders

O-rings, lids, gauges, pump parts, and cleaner parts. Bring the old part or a photo of the equipment label and we'll match it or order it.

Filter cartridges and grids

Replacement cartridges and DE grids for common filters, in stock or special-ordered.

Floats, toys, and games

Floats, toys, and games for the summer, in stock all season.

Free advice

Ask. The people at the counter service pools for a living.

Commonly asked questions

How do I take a water sample?

Use a clean bottle (a rinsed water bottle is fine). Reach in elbow-deep, away from a return jet and the skimmer, and fill it. Bring it in the same day if you can; a sample left in a hot car for two days isn't your pool anymore.

How often should I test?

If you're on weekly service, your tech tests every visit. If you're doing it yourself, test chlorine and pH at least twice a week in summer, and bring a sample to the store monthly for the full panel (alkalinity, calcium, stabilizer, salt).

Why is my calcium always high?

Local tap water is hard, and every time the pool evaporates and you top it off, the calcium stays behind and the new water adds more. Managing it means keeping pH in line, and every few years, a partial drain and refill.

Can you identify a part from a photo?

Usually. Bring the old part or a clear photo of the part and the equipment label (brand and model) and we'll match it. If we don't stock it, we can special-order most parts.

Do you carry spa supplies?

Yes. Spa chemicals, filters, and test strips alongside the pool aisle, plus advice on keeping a hot tub clear between drains.

Can I get advice without buying anything?

Yes. Ask. A wrong answer costs you a lot more than a free one costs us.

Customer reviews

What customers say about Gary's Pool Supplies

Recent 4- and 5-star Google reviews

Rating and review count are the totals on our Google Business Profile, including every review. Cards show recent reviews of 4 stars and up, newest first.

Google★★★★★ See Google reviews

Diann B. Google review
★★★★★
Good staff and service people. Listen to customers' concerns and respond appropriately. Efficient in answering billing questions. Solved a thorny pool issue I've been struggling with. Thanks!
Richard F. Google review
★★★★★
Had a pool cleaner that needed service. Gary's store fixed it back to working 100 percent. Works like new. Friendly service! If you have a pool cleaner that needs repair or advice, they're here for you. Thank you!
Danielle A. Google review
★★★★★
Customer service was prompt and friendly. Scheduling an appointment and payment was easy and fast.
▸ View our profile on Google Profile totals synced within 24 hours; updated Sep 24, 2026.

Bring in a sample this week.

Free water testing, open seven days, at 303 N Central Ave in Upland.

Get directions (909) 946-4393

Or text (760) 300-1476 for a quote. Replies in under 2 minutes.