So if i have an empty 500ml bottle of prime laying around how much safe do i need to add in order for it to be the same as if i were to buy prime?

I make mine in an empty plastic gallon container because more dilute is easier. Prime dosage is 1mL per 10g. You're wanting a total of 500mL to treat 5000g. For Safe, 1/4 of a teaspoon treats 300g. And, just to note, there are 3 teaspoons in a tablespoon. 5000/300=16.667 ||| .25tsp X 16.667 = 4.167 ||| 4.167/3=1.389So, 4.167 teaspoons in the 500mL bottle. Or for simplicity, 1.389 tablespoons. You could probably do 1 tablespoon and another 1/3 tablespoon aka a teaspoon.I've never made Safe so concentrated, you may need to use slightly warmed water to make sure everything gets saturated. Also always shake before you use it.

if 5gr of safe treats 100gal then 250gr treats 5000gal, and 5ml of prime treats 50gal then 500ml treat 5000gal as well and its the same price

1 gram of Safe treats of 200 gallons, 1 ml of Prime 10 gallons. 250 grams of Safe treats of 50,000 gallons, 500 ml of Prime 5,000 gallons. Thus, you get more for your money :).

What is the difference between safe & prime? i currently use prime but am interested in safe for my larger aquarium i just set up

Safe is basically the powdered form of prime, that's what we use in our shop ( we have over 600 aquariums)

Can i recharge purigen with safe?

Yes Please read: http://www.seachem.com/support/forums/forum/general-discussion/1771-is-safe-safe-for-purigen-re-charge strait from the Seachem support

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Safe 250gm

Product ID: 266775677

Details

Brand
Seachem
Item form
Powder
Item weight
0.65 Pounds
Liquid volume
240000 Liters
Number of Packs
1

💧Highly concentrated formula

🧪Detoxifies nitrite & nitrate

⚗️Neutralizes chlorine & chloramine

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Description

💧 Transform your tank, transform your vibe.

RAPID CLARITY BOOST - Transforms aquarium water quality quickly, ensuring a healthy habitat for your fish.
SAFE ALLERGEN FREE - Abalone-free formula designed for sensitive aquatic ecosystems.
TRUSTED BY THOUSANDS - 4.7-star rating from over 3,500 aquarists who demand the best.
ULTIMATE WATER DETOX - Eliminates harmful chlorine, chloramine, and ammonia for a pristine aquatic environment.
POWER PACKED CONCENTRATION - 250g treats up to 240,000 liters—max efficiency, minimal effort.

Seachem Safe 250gm is a highly concentrated aquarium water conditioner that neutralizes chlorine, chloramine, and ammonia while detoxifying nitrite and nitrate. Designed to treat up to 240,000 liters, it ensures rapid water clarity and a safe environment for fish, backed by a 4.7-star rating from over 3,500 users.

Specifications

ASIN	B0002A5WOC
Allergen Information	Abalone Free
Brand Name	Seachem
Country of Publication	USA
Customer Reviews	4.7 4.7 out of 5 stars (3,505)
Global Trade Identification Number	00000116038607
Included Components	all
Item Form	Powder
Item Type Name	Safe, 250 g / 8.8 oz
Item Weight	0.65 Pounds
Liquid Volume	240000 Liters
Manufacturer	Seachem
Manufacturer Part Number	386
Model Number	386
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	000116038607 000116068307
Unit Count	250 Grams

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