Whats That STAIN in Your POOL? (Vitamin C Test 🍊) @SwimUniversity
Whats That STAIN in Your POOL? (Vitamin C Test 🍊)  @SwimUniversity
Uploaded February 2026 | Updated September 2026, 1 day ago
The Pool Care Cheat Sheet (Free): swimu.com/cheatsheet
The Pool Care Handbook: swimu.com/book
The Pool Care Video Course: swimu.com/poolcourse
The Pool Care App: swimu.com/poolapp

Swim University makes pool and hot tub care easy for millions of homeowners. Each year, we continue to help more people with water chemistry, cleaning, and troubleshooting. We know taking care of a swimming pool or spa can be difficult. And it’s hard to find a trusted source of information. This is the reason we created Swim University.

Our Recommended Pool Supplies: swimu.com/supplies
Need more pool help? Go here: swimu.com/youtube
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What's That STAIN in Your POOL? (Vitamin C Test 🍊)

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