Home

Explore

View Cart

Deals

Saved

Suggested searches

Plant-based protein powders
Vegan leather handbags
Bedroom decor
Waterproof jackets
Hoodies

Learn more about how we use your data to personalize your experience and ads. Recommendations are for informational purposes only.

St. Cyr Pool & Spa

Products

Products

St. Cyr Pool & Spa

St. Cyr PH Decrease 3lbs

4.5 (1,234)

Sold 100+ last 30 days

20% off first order

$9.99

Color

Black

Quantity

Product description loading

Product description loading

This is the product description text that will appear here.

Shop is the next step on our mission to make commerce better for everyone.

Start selling

For brands

For creators

Build your store

Information

Shop Pay

Help center

Social

X (Twitter)

Instagram

Legal

Terms of Service

Privacy Policy

Your Privacy Choices

Powered by

|

Start selling for free

Language

© Shopify Inc. 2026

Quantity

1

Description

St. Cyr PH Decrease 3lbs (No Returns on Chemicals)
St. Cyr PH Decrease 3lbs is a granular acid product containing sodium bisulfate, used to safely lower the pH level in hot tubs and pools when it rises above the ideal range (generally above...

Delivery & Returns

St. Cyr Pool & Spa

4.8 (45)

You might also like

St. Cyr Pool & Spa

St. Cyr Chlorine Stabilizer 4lbs

St. Cyr Pool & Spa

Lifeline Long Lasting Algaecide-Vinyl 32oz

St. Cyr Pool & Spa

St. Cyr's Premium Complete Spa Chemical Kit

St. Cyr Pool & Spa

LifeLine 3" Chlorine Tablets (8 OZ WRAPPED) 25lbs

Hot Tub Things

Hot Tub Things® pH & Alkalinity Down (1.25 lb) – Granular Spa Water Reducer

St. Cyr Pool & Spa

Frog @Ease Test Strips Qty 30 01-14-3350

St. Cyr Pool & Spa

St. Cyr Spa Enzyme Treatment 16oz

Hot Tub Things

Hot Tub Things

Hot Tub Things

4.1

(198)

Hot Tub Things

FROG® @ease® XL Smartchlor® System for Bullfrog® Spas – Simplicity™ Series

(1)

St. Cyr Pool & Spa

Hot Tub Serum Total Maintenance Watercare 16 oz.

Hydropool 4520043 Low pressure filter

St. Cyr Pool & Spa

Signature (Fastflow) Low Pressure Filter (5"dia x 13"L) 4520043

St. Cyr Pool & Spa

SpaPure Natural Clear 1PT

Hot Tub Things

FROG® Target™ Total Alkalinity Increaser – Stabilize Spa Water Balance

St. Cyr Pool & Spa

Essentials Hot Tub Maintenance & Cleaning Scrubber 6000

St. Cyr Pool & Spa

AquaChek 4-1 Bromine Test Strips 521252A

St. Cyr Pool & Spa

Lifeline #5 Calcium Hardness Increase 25lbs

St. Cyr Pool & Spa

St. Cyr Algaecide 60 1qt

St. Cyr Pool & Spa

St. Cyr Liquid Chlorine Shock 1 Gallon (Case of 4)

Budget Pools

Hot Tub Things

SpaGuard Brominating Concentrate (2 lb)

St. Cyr Pool & Spa

Bullfrog Spas Replacement Pillow for STIL Spa, Cool Gray 2015-Present 60-1360

St. Cyr Pool & Spa

SpaPure PH Down 1.5 lbs

St. Cyr Pool & Spa

Spazazz Moments Collection Spa & Bath Crystals -Celebrate 22oz SPZ-001

Hot Tub Things

Hot Tub Things® Metal Out (16 fl oz) – Spa & Hot Tub Stain & Scale Preventer

St. Cyr Pool & Spa

Spa Pure Alkalinity Increaser 1Lb

Freshwater pH/Alkalinity Decreaser,

Shopspasupplies

Freshwater pH/Alkalinity Decreaser,

St. Cyr Pool & Spa

JED Standard Dual Test Kit JED00481

Hot Tub Things

FROG® Maintain™ for Hot Tubs – Non-Chlorine Shock Treatment 12 Pack

(5)

St. Cyr Pool & Spa

Serena Spa Instant Cartridge Cleaner 32oz LST-50-979

6 Lb Pool Breeze Ph Decreaser by Pool Supply Depot

Pool Supply Depot

6 Lb Pool Breeze Ph Decreaser

Cleartub

Cleartub

4.9

(117)

Frog @ease cartridges are used to keep your spa water clean and clear

St. Cyr Pool & Spa

St. Cyr Spa Stain & Scale Metal Control

St. Cyr Pool & Spa

ST. Cyr Alkalinity Increase 5lbs

St. Cyr Pool & Spa

Phoenix SuperPhos Phosphate Remover 32oz

St. Cyr Pool & Spa

Hot Tub Serum Total Cleanse Watercare 2oz

St. Cyr Pool & Spa

St. Cyr Spa Granular Chlorine Dichlor 2lbs

St. Cyr Pool & Spa

AquaChek Silver 7 In 1 Test Strips AC551236

St. Cyr Pool & Spa

Spa Pure 2lb Alkalinity Increaser SPA2693CS20B2

St. Cyr Pool & Spa

Spa Pure 16oz Hardness Increaser C002729-CS20B6

St. Cyr Pool & Spa

SpaPure Bromine Starter Spa Care Kit

St. Cyr Pool & Spa

Leisure Time Jet Clean 16 fl oz. 3525

The Cover Guy

4.7

(1.2K)

Hot Tub Things

Silk Balance Natural Hot Tub Water Care-Weekly Spa Maintenance Solution-4 Month Supply-Balancer, Clarifier-Conditioner - Great Water Made Simple, Soft and Safe (76 fl oz)

St. Cyr Pool & Spa

Lifeline 3" Chlorine Tabs 15lbs (8oz Wrapped)

The Spa Supply Store by Jacuzzi® Hot Tubs of the Triangle

Natural Chemistry Spa pH Decreaser (3.37lbs)

St. Cyr Pool & Spa

Lifeline #2 PH Minus 6LBS 2306BGT

Bold & bright tablescapes

Bold & bright tablescapes

Enamelware, linens, and fruit serveware.

St. Cyr Pool & Spa

Lifeline #1 PH Plus 2LBS

Hot Tub Things

SpaGuard® Rapid‑Dissolve Shock Oxidizing Tabs – 1.25 lb Non‑Chlorine Spa Shock

St. Cyr Pool & Spa

Serena Spa® Cartridge Cleaner 32oz 0180

Bottle of Aqua pH Minus on a wooden block with a towel in the background

RnR Hot Tubs

Aqua pH Minus - 3kg (pH-)

St. Cyr Pool & Spa

Lifeline #3 Stabilizer 4LBS 2604BGT

Hot Tub Things

SpaGuard® Rapid-Dissolve Alkalinity Increaser Tabs – 1.25 lb

St. Cyr Pool & Spa

St. Cyr Copper Algaecide 70 1 Qt

St. Cyr Pool & Spa

St. Cyr Alkalinity Increase 25lbs

Natural Chemistry Spa pH Decreaser 2 lb bottle for balancing spa water

32% off

ePoolSupply

Natural Chemistry Spa pH Decreaser 2 lb Water Balancer | 14203NCM

St. Cyr Pool & Spa

Spazazz Original - French Vanilla Calm Aromatherapy Crystals 17oz SPZ-102

Hot Tub Things

Hot Tub Things® pH & Alkalinity Up – Premium Water Balance Solution

(1)

SunDrift

1.6

(631)

St. Cyr Pool & Spa

JED 20" Commercial Flex Wall Brush JED70279

St. Cyr Pool & Spa

Lifeline #2 PH Minus 3lbs 2303BGT

St. Cyr Pool & Spa

St. Cyr Spa Calcium Increaser 2lb.

St. Cyr Pool & Spa

Lifeline #5 Calcium Hardness Increaser 4LBS

Hot Tub Things

SpaGuard® pH Decreaser – Granular Spa pH Reducer (22 fl oz)

(1)

St. Cyr Pool & Spa

St. Cyr's Spa Water Balance Kit – PH/Alkalinity Up and Down Plus Calcium

Living room glow up

Living room glow up

Chic lighting, side tables, and linen layers.

St. Cyr Pool & Spa

Spa Pure Clarifier 1PT C003186-CS40P

Hot Tub Things

FROG® DropH™ pH & Total Alkalinity Decreaser (3 lb)

St. Cyr Pool & Spa

Phoenix Super Phos Phosphate Remover 32oz

St. Cyr Pool & Spa

Spa Frog Filter Mate Mineral Sanitizer 01-14-3712

St. Cyr Pool & Spa

St. Cyr Chlorine Free Shock 2lb

(1)

St. Cyr Pool & Spa

FROG Maintain™ Chlorine-Free Shock Treatment (16oz) 01-14-6134

Hot Tub Things

FROG® StoMPS™ Non-Chlorine Oxidizing Shock for Hot Tubs & Spas

(2)

St. Cyr Pool & Spa

Scum Sponge Wonder Flower 6860

Hot Tub Warehouse

Natural Chemistry Spa pH Decreaser - 3.37 Pounds

(1)

St. Cyr Pool & Spa

St. Cyr Chlorine Free Shock 5lb

(1)

St. Cyr Pool & Spa

St. Cyr Spa Granular Dichlor 5lbs

St. Cyr Pool & Spa

Lifeline #4 Alkalinity Increaser 5LBS 2255BGT

Hot Tub Things

SpaGuard Brominating Concentrate (6 lb)

St. Cyr Pool & Spa

Hot Tub Serum Total Maintenance 2Ltr WM-001

54% off

American Sale

Malibu pH Decreaser (3 lbs or 6 lbs)

(1)

St. Cyr Pool & Spa

Spa Pure Stain & Scale Preventer 1PT

Hot Tub Things

SpaGuard® Chlorinating Concentrate – Granular Spa Sanitizer (2 lb / 5 lb)

St. Cyr Pool & Spa

Spa Pure Filter Cleaner 1PT

(1)

Small kitchen musthaves

Small kitchen musthaves

From Our Place, Pyrex, and Caraway.

33% off

St. Cyr Pool & Spa

SpaPure Brominating Tabs 1.5lb C002510-CS20B1

St. Cyr Pool & Spa

AquaChek Copper Test Strips AC661454

Hot Tub Things

FROG® @ease® SmartChlor® System for Bullfrog® Spas – Simplicity® Series

(2)

St. Cyr Pool & Spa

Spa Essentials The Cover Rock-IT