How long after using do you re- test to see how much the pH went up?

We would recommend waiting about a half-hour in order for the water to fully circulate so that you get an accurate reading. If you have a very large system or very little flow, you may want to wait 1-2 hours. You are safe to re-dose at that point as long as you have not changed more than 0.2 in pH, which is the maximum we recommend changing within a 24 hour period to reduce fish stress. If you have any other questions, feel free to reach out to us at 1-800-847-0659 or APITechServices@effem.com

Can this be used in a tank with invertebrates?

Yes. Many years ago this was labeled for ponds

This should be fine for a Brackish tank?

You can use it however the KH of a brackish tank might prevent you from lowering the ph. Please contact API at 1-800-847-0659 and we can help.

Api Ph Up Aquarium Ph Adjuster 4 Ounce

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Description

⚡ Elevate your aquarium’s pH game—clear, quick, and confidently balanced!

CRYSTAL CLEAR WATER - Enhances alkalinity without compromising water clarity—no cloudiness, no stress
COMPACT 4 OUNCE SIZE - Perfectly sized to last longer than typical small droppers—more value, less hassle
TRUSTED BRAND QUALITY - From API, a leader in aquarium care, made in the USA for reliable performance
OPTIMIZED FOR FISH HEALTH - Maintains ideal pH balance to support vibrant, thriving aquatic life
FAST ACTING LIQUID FORMULA - Instantly raises aquarium pH for a healthier aquatic environment

API PH Up Aquarium PH Adjuster is a 4-ounce fast-acting liquid solution designed to raise and stabilize the pH level of aquarium water. It increases alkalinity without clouding the water, ensuring a clear and healthy environment for aquatic life. Manufactured by API in the USA, this compact and efficient formula offers precise pH control, making it a trusted choice for aquarium enthusiasts seeking optimal water conditions.

Specifications

ASIN	B0002AQMVO
Best Sellers Rank	#45,967 in Pet Supplies ( See Top 100 in Pet Supplies ) #930 in Water Treatments
Brand	API
Country of Origin	USA
Generic Name	API PH Up Aquarium PH Adjuster, 4-Ounce
Global Trade Identification Number	00317163030318
Importer	VM CLASSIC PETS
Included Components	API PH Up Aquarium PH Adjuster, 4-Ounce
Item Dimensions LxWxH	38 x 38 x 133 Millimeters
Item Form	Liquid
Item Weight	136 g
Item model number	31C
Liquid Volume	4 Fluid Ounces
Manufacturer	Aquarium Pharmaceuticals, Aquarium Pharmaceuticals
Net Quantity	118.0 Milliliters
Packer	API FISH CARE
Product Dimensions	3.81 x 3.81 x 13.34 cm; 136.08 g
UPC	317163030318

Reviews

R**L

Good

18.08.2018

M**R

Love the size that should get me longer than the small dripper we all get in the first water treatment kit.

12.09.2023

M**N

Excellent and I recommend it

27.01.2024

N**K

No complaints.

8.11.2021

H**Y

Works great ups kh more and quicker than ph, notice change in 1-2 days. Recommend cleaning filter and pouring it into the filter for quicker change.

17.04.2025

T**H

Works great

18.12.2025

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