Seachem Prime Concentrated Conditioner, 500 ml

This bottle’s built for serious water prep—removes chlorine, chloramine, detoxifies ammonia and nitrite, and supports biofilter health. Geared toward freshwater and marine tanks, whether you’re doing full water changes or topping up. One capful treats 200L, so the 500ml bottle lasts ages. Works well in van stash, fish rooms, or home aquariums where water quality needs to stay tight. No smell, no clouding, and safe for all species. Ideal for new setups, emergency spikes, or routine maintenance. Can be used alongside meds and other treatments without clashing. Best dosed with a syringe or pipette for accuracy—cap measurements are rough. 👍 Pros ✅ Highly concentrated—small dose, big coverage ✅ Detoxifies ammonia and nitrite—supports cycling ✅ Safe for all fish, inverts, and plants ✅ No smell or residue—clean dosing ✅ Long shelf life—stays potent 👎 Cons ❌ Cap dosing is vague—use a syringe for precision ❌ No colour indicator—can’t see it in water ❌ Not a full-on bacteria booster—use with bio support if needed

Always use this product with other seachem products. One of the best and cheaper on amazon than I have seen. Generally I use after a water change. I use with clarity and the water quality is at its best when used. Very effective in keeping water quality and cost effective buying bigger bottles. Works quickly so I know my aquarium and fish are safe.

It doesn't just remove chlorine; it actually 'binds' ammonia and nitrite into a non-toxic form for up to 48 hours. This was a total lifesaver for me during a mini-cycle. It’s a five-star, high-quality product that gives you proper peace of mind every time you do a water change. Plus, it helps the fish produce their own natural slime coat rather than just adding a fake oily one. Brilliant stuff!

I never feel comfortable using anything else. I notice flashing, erratic swimming with API products. Seachem has fantastic technology backed by science not random additions of essential oils. I’ve now subscribed to Prime deliveries (Prime delivered by prime lol) so my goldfish get consistent, robust water change support each time. I recommend a pipette for truly accurate dosing as most of us can admit to missing the mark using bottle caps alone!

Very good product. Does exactly what it’s supposed to.

Always use prime, seems to beat out of all the similar products and hasn't given me any issues. There is a smell from it that's quite strong, but once the lid is on, it goes away and you can't smell it once it's mixed in the water. Amazon sell it for the best price, so it's my go to.

Use this all the time for my fish tank, wouldn't use another product, great for removal of ammonia, simple to use for water clarity and safety

Great product. Unrivalled value for money. Used for years and will continue to do so