523540 Flow Switch for PentairĀ® EC-523476 and 523476 ChemCheck Swimming Pool Water Testing, Pool Water Quality Monitoring System
Enhance your pool water management with the 523540 Flow Switch designed to seamlessly integrate with PentairĀ®’s EC-523476 and 523476 ChemCheck Swimming Pool Water Testing Systems. Engineered to deliver precise flow monitoring, this innovative accessory ensures optimal performance and accuracy in your pool water quality monitoring regimen.
Crafted with reliability in mind, the 523540 Flow Switch provides robust functionality, allowing you to maintain consistent water flow rates essential for accurate chemical analysis. Its compatibility with the PentairĀ® ChemCheck systems streamlines installation and operation, offering a hassle-free solution for maintaining pristine pool water conditions.
Designed for durability and efficiency, this flow switch is built to withstand the rigors of continuous pool operation, ensuring long-lasting performance and dependable monitoring. By incorporating the 523540 Flow Switch into your pool maintenance routine, you can enjoy peace of mind knowing that your water quality is continuously monitored with precision and reliability.
Upgrade your pool management system today with the 523540 Flow Switch, and experience enhanced efficiency and accuracy in maintaining optimal pool water quality
PentairĀ® ChemCheck Useful Links
- Find more information on ChemCheck at PentairĀ®.com
- ChemCheck / PentairĀ® Home User’s Guide
- ChemCheck Install Guide – English
- ChemCheck Install Guide – Spanish
- ChemCheck Install Guide – French
- ChemCheck Quick Start Guide – English
- ChemCheckĀ Quick Start Guide – Spanish
- ChemCheck Quick Start Guide – French
- ChemCheck Brochure – English
- ChemCheck Brochure – Spanish
- ChemCheck Brochure – French
PentairĀ® ChemCheck Replacement Parts

1 – Top Cover 523527
2 – Flow Valves (inlet AND outlet) 523539
3 – Flow Switch 523540
4 – Power Supply (includes Item 6) 523526
5 – Battery Pack 523387z
6 – Battery Cover 523396z
7 – Electrode 523399z
8 – Drain Plug Assembly 523522
9 – Reservoir 523506z
10 – Reservoir O-ring 523516z
11 – In-line Filter 523441z
12 – Install Hardware Kit 523440z
13 – Tubing, 20 ft. 521814
14 – Tube Fitting 523439Z
15 – Antenna 523385z
16 – Base Assembly (includes Items 2, 3 and 14) 523541
Please be advised that certain manufacturers - including Pentair® (with their TradeGrade® products), Jandy®/Fluidra® (with their Trade Series Exclusive™ products), and Hayward® (with their Expert Line® products) - do not honor manufacturer warranties on specific product lines purchased online.
These policies are intentionally enforced by the manufacturers to prevent customers from purchasing the same products at lower prices online.
Warranty coverage for these products is generally only available when purchased in person from an authorized local dealer.
While we strive to take care of our customers by offering the lowest possible prices on brand new, genuine products, we do not provide warranty coverage ourselves, nor can we guarantee that the manufacturer will honor the warranty on products purchased from our online store.
It is the buyer’s responsibility to confirm warranty eligibility directly with the manufacturer before making a purchase.
If you are a local customer, you may be able to purchase these items in-store and obtain manufacturer warranty coverage. However, for many of our customers across the country, paying significantly more locally just to access a manufacturer warranty often doesn’t make financial sense, especially when some local suppliers charge considerably higher prices.
By completing your purchase, you acknowledge and agree that we are not responsible for warranty support or claims denied by the manufacturer due to their online sales restrictions.

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