will this lower my ridiculously high KH w/o the need to keep dosing my tank, but just the replacement water during water changes?

If you look on the container it states it converts KH into CO2. Your KH is what helps keep your PH from lowering, so in order to lower your PH you will need to lower your KH first. This acid buffer is mostly used in tanks with plants. That way they can remove the excess C02 from the water. Word of caution: if you don’t have plants, and use too much then you'll have a lot of CO2 which will cause a quick change in PH and will more than likely kill off any fish. An easier but slower way to lower your KH is by getting distilled water, using a reverse osmosis system or a deionization filter and doing water changes that way. It will take more time but works well as there will be no GH or KH in that water which means lower PH. Keep in mind if you are using tap water, the water may be high in KH and it won't help to replace with that.

Does this work on soft water?

This changes the PH, it doesn't matter if the water is hard or soft.

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Seachem Acid Buffer 600gram

Product ID: 386856988

Details

Brand
Seachem
Liquid volume
600
Item weight
0.6 Kilograms
Item form
Powder
Manufacturer
Seachem Inc.

🌿Optimized for planted aquariums

🧪Phosphate-free formula

⚖️Precise pH control

MOP$502

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Description

🌿 Master your aquarium’s pH like a pro—because your plants deserve the best!

EASY DOSING - Simple 1/4 teaspoon per 20 gallons daily with optional digital spoon scale for accuracy
MASSIVE COVERAGE - 600g treats up to 3000 US gallons—ideal for large or multiple tanks
ALGAE FREE CLARITY - Phosphate-free buffering prevents algae blooms and water cloudiness
PRECISION P H TUNING - Gradually lowers pH between 6.0 and 8.0 for perfect aquatic balance
PLANTED AQUARIUM FRIENDLY - Specifically formulated to support lush, healthy aquatic plants

Seachem Acid Buffer is a 600g phosphate-free powder designed to precisely lower and stabilize pH levels between 6.0 and 8.0 when used with Alkaline Buffer. Perfect for planted aquariums and hard water environments, it prevents algae growth and cloudiness while converting carbonate alkalinity into available CO2, supporting vibrant aquatic plant life. Treats up to 3000 gallons with easy, gradual dosing.

Specifications

Product Dimensions	16.26 x 7.37 x 7.37 cm; 600 g
Item model number	243
Pet Life Stage	all stages
Item Form	Powder
Allergen Information	Abalone Free
Size	600 grams
Number of Items	1
Quantity	1
Specific Uses	habitat
batteries required	No
Batteries Included	No
Item Weight	600 g

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