Instruction reads use 1 capful for every 50 gallons of new water. So a 35% change on 55 gal. tank, takes 1/4 cap? Sounds too good to be true.

Per Seachem's instructions, if you are doing a partial water change of 35%, if you are adding water directly from the tap (such as with a water changer such as a Python or Aqueon) you add enough Prime for the volume of the whole tank. On the other hand, if you're removing 35% and then adding the water using a bucket, you can dechlorinate the amount of each bucket. For example, if you're using a 3 gallon bucket, 6 drops Prime per bucket, and then add that to the tank. The Prime works almost immediately, so just add the drops to the bucket, and then it is ready to pour into your tank.

How long does it take to work when setting up a new tank? Thanks!!

this removes the chlorine, etc. almost immediately, I add it to the aquarium when doing water changes, ands just pour the water into the tank. remember this just removes the harmful chemicals, your tank will still have to cycle through the nitrogen cycle if you are setting up a new tank.

I end up with alot of foam at the top of my aquariums when I add prime,Have I added too much to my tap water changes,My Tap water is high in iron

The small bottle of prime has a flip cap which allows you to add drops. If you have the large bottle of Prime use an eye dropper. When doing a water change, fill a clean, never seen soap or chemicals bucket of fresh water and add Prime to this fresh water, not directly into your tank - 2 drops per gallon. I also do not get foam. I do a 50 - 60 percent water change weekly along with a gravel vac. If you are stll getting foam after a gravel vac and water change I would suggest you give Seachem a call. They have great customer service. When cleaning your tank, give your filter sponge, floss a swish around in used tank water also to remove some of the gunk and put right back in. Do not rinse in untreated fresh water, by doing so you can lose your cycle.

I'm looking to remove chlorine from my pool, will this work?

It will work but there may be less expensive options from a pool dealer. It decholorinates any typerson of water.

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Reviews

F**D

Excellent product

Products is very effective in reducing chlorine content and required only 5ml for 200L of water.

12.11.2024

D**N

Must have for aquarists!

You'll definitely need a as the tap water isn't safe for fishes, and seachem prime is one of the best out there.

22.09.2024

J**N

Good Product

Highly recommended product

23.01.2026

G**M

As mentioned same contended

Good for new tank

12.10.2024

A**R

Good

Good but unfortunately Bottle wash smashed. Not sure if it's a reject

7.11.2025

J**E

I like it

Very effective

23.04.2024

V**R

Great product

Use for anti chlorine

24.09.2023

E**.

Perfect!!

I love this product

24.10.2023

N**S

Le produit a un réel impact sur les analyses d'eau, très efficace à petite dose. Seul aspect dérangeant: son odeur de soufre à l'ouverture de la bouteille. Mais une fois dans l'eau ça ne sent rien. J'ai reçu par contre une bouteille abimée, l'embouchure était tordue et une fois enlevé l'opercule, l'étanchéité était compromise, j'ai dû transvaser le produit dans une autre bouteille.

24.04.2024

J**E

The prime cleans up the slime! It is so divine, you'll certainly not mind the word on the vine is this stuff is sublime! Make sure to choose prime, for your brine!

7.09.2025

S**R

Great product and such a small amount required at water change. Highly recommended. I used for my newly hatched Axolotl and also my tropical fish tank.

23.03.2025

J**Z

Producto necesario e indispensable para todos los que tenemos acuario en casa. Rinde muchísimo ya que una sola gota trata varios litros y el efecto es inmediato. Si utilizas agua del grifo para cambios de agua es necesario utilizar prime para eliminar cloro y cloraminas. Además sirve para una emergencia temporal donde tengas un pico de amonio o nitritos reduciéndolos de manera inmediata. Es un seguro para tu acuario tenerlo en casa. Totalmente necesario y de la marca reconocida Seachem.

17.10.2025

M**I

なぜか他のを使うと金魚がめっちゃクレイジーになる。これだと普通に泳いでる。何が違うかわからんが。

3.10.2023

ASIN	B00025694O
Allergen Information	BPA-Free
Batteries Included	No
Best Sellers Rank	#209 in Pet Supplies ( See Top 100 in Pet Supplies ) #1 in Aquarium Water Quality Testing & Treatment
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (38,958)
Date First Available	7 August 2012
External Testing Certification	Não aplicável
Item Form	Liquid
Item Weight	281 g
Item model number	67104330
Number of Items	1
Pet Life Stage	All Life Stages
Pet Type	Aquatics, Aquatics Water Conditioner, Aquatics Water Conditioner Conditioners, PetSupplies
Product Dimensions	16.76 x 6.35 x 5.84 cm; 281.23 g
Quantity	1
Size	500 mL
Specific Uses	Active
Volume	500 Milliliters
batteries required	No

Prime 500ml

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