You will want to use only a drop per gallon 3 8 litre as it is very strong.
Api water conditioner vs prime.
50 ml 100 ml 250 ml 500 ml 1 l 2 l 4 l.
Stress coat prime and lots of other things are called tap water conditioners.
Both are ideal for use with prime.
The formula of api tap water conditioner incredibly concentrated.
Not only is seachem prime a complete conditioner but i found that it lasts the longest.
Some water conditioners like stress coat also neutralize heavy metals and help replace damaged slime coats.
As a water conditioner seachem prime is unbeatable.
I ve not used it but i have used other live bacteria products such as microbe lift.
When transporting or quarantining fish use seachem stressguard.
Use at start up and whenever adding or replacing water.
When adding new fish use stability.
At the very least tap water conditioners neutralize chlorine and chloramine which are disinfectants commonly used in municipal water supplies.
Seachem prime fresh and saltwater conditioner 4 8 out of 5 stars 11 294 1 best seller in aquarium water treatments.
It should be used with every water change.
This conditioner comes in liquid form.
It will also detoxify any heavy metals found in the tap water at typical concentration levels.
As you said prime is a water conditioner one of the best imo that neutralizes ammonia and other toxins from your water.
Api tap water conditioner similar to the seachem api tap water conditioner will remove chlorine from the tap water and will also work to eliminate heavy metals and chloramine.
Quickstart is a live bacteria product that is as you said used to decrease cycling time.
If you use a water conditioner with your aquarium then you are likely nodding along at my top pick.