Check the listing for details. CrystalClear pHGuard Buffer, 2 LB, CC011-2 UPC 023796003352. Condition: New. Listed at 16.99 USD. CrystalClear pHGuard 2 lb pH Buffer Prevents Wide pH SwingsSustains pH at Safe LevelsSafe for All Aquatic & Domestic Animals When used as directed, CrystalClear pHGuard will stabilize pond water pH and maintain buffering capacity as safe levels between 80-240 ppm. CrystalClear pHGuard will help prevent wide pH swings which are typical from morning to night. CrystalClear pHGuard makes pond water safe for fish and plants and helps keep water balanced in the hot summer months. Keeping a properly buffered system is essential for the completion of the nitrification process, which allows harmful ammonia to be converted to nitrite and then to nitrate. CrystalClear pHGuard Dosage Rates:Up To 1,000 Gallons4 OuncesUp To 2,000 Gallons8 OuncesUp To 4,000 Gallons16 OuncesUp To 8,000 Gallons32 Ounces Routine Application RateApply pHGuard™ once a week and after each water change. For Best ResultspH is typically lowest at dawn and highest at dusk so it is important to test pH at the same time of day. Product NoticesDrastic changes in pH may cause algae blooms, fish and plant stress and possibly death. Safe pH ranges for pond fish and plants is 6.5 – 8.0. Size: Two (2) pound Jar