Powerful algae control
This formula is 3x stronger than HTH® Algae Guard 10. Use weekly to kill and prevent regrowth of all algae: green, black and yellow/mustard.
Non-foaming, fast-acting
Add HTH® Algae Guard 30 directly to your swimming pool water and swim just 15 minutes after.
Compatible with all pools
This product is great for all swimming pools including vinyl-lined and salt water systems.
You’re all clear with HTH®
For best results, use HTH® Algae Guard 30 as part of your weekly maintenance routine. Works great with HTH® Shock products.

How to use
HTH® Algae Guard 30
1. Measure Correct Amount
Follow the on-pack instructions for correct dosage according to your swimming pool size.
Follow the on-pack instructions for correct dosage according to your swimming pool size.
2. Add Directly to Pool Water
Make sure the pump is running.
Make sure the pump is running.
3. Use Weekly
For best results, add every 3 – 5 days. HTH® Algae Guard 30 is also a great addition to your swimming pool opening and closing routine.
For best results, add every 3 – 5 days. HTH® Algae Guard 30 is also a great addition to your swimming pool opening and closing routine.