Aquarium Clarifier

Aquarium Clarifier; clears cloudy fish tanks quickly
Product No. ML90604-00
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Clears Cloudy Water Fast
  • Safe for fish, plants AND invertebrates.
  • No harmful copper or formaldehyde.
  • Traces of iron increase effectiveness and safety.
  • Safe in soft water conditions.
  • Quickly clumps suspended particles due to overfeeding, gravel dust and turbidity associated with aquarium maintenance.
  • For freshwater aquariums

Hi - I changed the water in the aquarium and added the prescribed amount of Clarifier. It's been 4 days and the water is still cloudy. It seems I can add some more Clarifier per the posted Q&A, however, do I need to change 20% of the water first?

Asked by: Rose2662
That depends on how long the tank has been set up, and what is causing the cloudy water. If this is a brand new tank - less than a month old, then yes, I would recommend the partial water change first, as it could be due to something like an ammonia spike. Also, if you have not tested your water quality recently, you may wish to do that first to ensure you are treating the cloudy water correctly. For water quality issues, you would not want to use the Water Clarifier, but Bio Spira Freshwater Bacteria, instead, for example. BREX
Answered by: BREX
Date published: 2017-01-24

What ingredients are in this product?

Asked by: Alicia2222
It is an aluminum based flocculent with support minerals to help the floc process. BREX
Answered by: BREX
Date published: 2018-02-02

How often can you use this to rid the algae bloom? No algae on glass. Vac bottom every week. within 2 weeks the water is totally green. You can't even see the fish and they die. Can't stop the bloom. New tank 2 75 gal filters. change filters weekly.

Asked by: Dan Pruett
Thanks Dan Pruett, for your support of Marineland products! Algae is caused by excess nutrients, so you need to determine why you have this issue in order to eradicate the algae. When you vacuum the bottom of the tank, make sure to take out 10- 20% of the water. Don't take out a lot since you are vacuuming weekly. Taking too much could disturb your biological filter. Also, test your ammonia, nitrite, and nitrate levels. They should be 0 for ammonia and nitrite, and less than 10 ppm for nitrate. Test both your tank and your tap water to compare them. You mention it is a new tank, that you are changing water once a week, yet it is green two weeks after the water change. This doesn't compute. Make sure you are not over feeding. If the tank is about a month old, feed once a day, one piece of food per inch of fish, at most. Make sure all food is eaten in 30 seconds or less, and none has time to drift down to the gravel. Next, add some Marineland Bio Spira Freshwater Bacteria to get your biological filter established. Do this after a water change, and then try to not do any water changes at all for at least a couple of weeks. And last, make sure the lighting is proper for your tank. Don't leave it on more than 8 hours a day, and make sure the tank is not near a window or glass door. BREX
Answered by: BREX
Date published: 2017-09-28

If needed, when can I add a second doseage

Asked by: Molson1
Wait 48-72 hours to give it time to fully take effect, then do a small partial water change and re-dose. BREX
Answered by: BREX
Date published: 2016-12-08

Can the Clarifier be used in salt water tanks?

Asked by: gpers
Unfortunately, no, it is for freshwater only. BREX
Answered by: BREX
Date published: 2016-09-19

how often can aquarium clarifier be used

Asked by: leigh23
Once every 48-72 hours. 2-3 doses should clear all cloudy water issues, unless the tank is extremely under-maintained. BREX
Answered by: BREX
Date published: 2016-08-01

which cap do you use? The Entire thing or the Smaller part?

Asked by: SirMeowsington
You use the measuring cup that comes with it. It has lines on it for 5 ml and 10 ml. Follow the instructions and dose for the size of your tank. BREX
Answered by: BREX
Date published: 2016-04-25

I used the clarifier  and it did not work. Waited 24hrs treated  again and it still  didn't work.   Did a 25 percent water change in the beginning   Still have cloudy water.  Help!

Asked by: Pink lady
First, cloudy water is caused by a number of things. Secondly, these types of chemicals are slow moving. So we generally recommend waiting 48-72 hours after the first dose, then re-treat. If your cloudy water is actually due to a bacterial bloom or some type of microscopic bloom, and not an organic matter issue, then we would recommend adding Aquarium Bacteria instead of the Water Clarifier. I would let the tank sit a couple of days after your last dose, and if it does not clear, then try the bacteria. One other thing, make sure your filter cartridges are in place when using this product so they may pull the organic matter out once it is clumped. BREX
Answered by: BREX
Date published: 2016-04-18

How often can I put in tank

Asked by: Mgrace
Once every 3 days if you are having a cloudy water issue. BREX
Answered by: BREX
Date published: 2016-04-15

so u should wait 72 hrs before retreating with clarifier if its still cloudy ???

Asked by: Pink lady
Yes, correct. Water clarifiers and algaecides are slow moving to prevent shock and loss of fish. So you want to give it enough time to remove whatever is clouding the water. Be sure to keep your filter in operation like normal. It will need the mechanical media in order to remove what the chemical clumps. If it is not completely clear within 72 hours, do another dose. BREX
Answered by: BREX
Date published: 2016-04-15

i put the Clarifier in at 1:00 took my filter out just now at 6:00  did not know i was suppose to do that to i just read it here  should i put more in now  because my filter was still in ?

Asked by: Pink lady
No, you are fine. With many of our medications, etc, you do need to remove the carbon. However, with the water clarifier you do not. BREX
Answered by: BREX
Date published: 2017-01-27

why doesn't your bottle of clarifier tell u to take out your carbon filter?

Asked by: Pink lady
Because there is no need to, it works with or with carbon. BREX
Answered by: BREX
Date published: 2016-04-14

tried treatment yesterday how long till can redose?cloudy water

Asked by: bcwaterguy
Good morning, Thank you for your inquiry. With this product we would recommend that you wait for 48-72 hours and then retreat the tank if necessary. However, depending on the type of cloudy water that you have, this product may help. If the tank is foggy cloudy, then this is typical for an ammonia spike for which this chemical will not assist with as it is a chemical unbalance in your tank. Water Clarifier is used to remove floating particulates in your tank (like left over food or fish waste) to help sink these down so the filter can remove them from your tank. MINI
Answered by: MINI
Date published: 2016-03-28

How frequently can this product be used? I used it 4 days ago, it didn't clear the cloudiness, however i did forget to remove the carbon filter. Tank has been cloudy since we started it in late January 2016.

Asked by: Greg D
If you have not done any water changes, I would first vacuum the gravel and change about 25% of the water. You are experiencing a stubborn bacterial bloom it sounds like. You can also add our Bio Spira product to help clear it up if you prefer an all natural method. In regards to the Water Clarifier, you want to dose no more than twice, with 72 hours in between the doses. Remove the carbon media, keep the filter operating, and replace the carbon after about 5 or 6 hours. BREX
Answered by: BREX
Date published: 2016-03-01

I have a betta fish in a 2-1/2 gal. tank & I use spring water due to extreme hard water conditons in our area. How often can I use this product?

Asked by: Michaella
You dose once, wait 72 hours, and re-dose if it has not completely cleared it up. You should not need to re-use it very often, if you are properly maintaining the tank. BREX
Answered by: BREX
Date published: 2014-11-10

how often can I use Aquarium Clarifier?

Asked by: mharaway
Dose once every 72 hours for up to three doses total. This should clear up any type of cloudy water. BREX
Answered by: BREX
Date published: 2014-10-15


The cloudiness didn't clear up in 24 hours. The water test good and the fish are doing fine. It's an eyesore and everyone in the office comments on the tank.
Asked by: KATE
This is a slow working product. You want to give it 48-72 hours. If it does not completely clear, then redose at 72 hours. Also, be sure to remove your carbon filter from the tank for 2-4 hours, then put it back in. The carbon will pull the treatment out of the water if you do not do this. And if you leve the carbon cartridge out the entire time, your filter cannot pull out the particles that the product clumps. So it is important to take it out AND put it back. BREX
Answered by: BREX
Date published: 2016-03-11

How often can or SHOULD I use Aquatrium Clarifier

Water was very cloudy and many particles floating in water-It tested well- Tuesday evening I added your Aquarium Clarifier and 50% improvement Wed. morning- 90% improvement today(Thursday morning----still some small particles moving around- Again, How often can I or should i add your clarifier?
Asked by: RonM
You want to give it 72 hours, and then re-treat. BREX
Answered by: BREX
Date published: 2014-09-22

With an outdoor pond and waterfall, (300 gal.) how often can I treat with Marineland Clarifier? There are 12 goldfish, about six inch long each.

Asked by: Dickiebird123
No more than once every 3 days, when treating an actual problem, and be sure to do a 25% water change prior to dosing. For regular treatment, once a week. BREX
Answered by: BREX
Date published: 2014-08-14
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ML90604 - 8 fl oz