Sludge Reducer

Product No. 16736

Sludge Reducer is rated 3.0 out of 5 by 2.

Look no further for how to remove pond sludge! Sludge Reducer blocks brake down unsightly sludge awhile helping boost pond's biological filtration level. Ideal when setting up new ponds and during fall winterizing and spring start-up. Beneficial bacteria and enzyme blend helps balance the pond's biological needs, resulting in cleaner, clearer water.

Sizes Available

This product comes in the following sizes 4 ct, 16 oz and 40 oz

Product Reviews
Question & Answer

Rated 5 out of 5 by bhd1960 from Worked perfectly 2 year old, small outdoor pond, about 75 gallon. Went from very cloudy to crystal clear in a week. Koi are zooming around having a ball now that they can see! I hadn't even known there were black ones in there...1 month so far, all is well. Will be dropping next pellet in tomorrow. Their behavior has been very consistent for the 2 years. Hope nothing bad happens. so sorry the other reviewer had a disaster, I wonder what the difference was?

Date published: 2016-08-14

Rated 1 out of 5 by veryupset from added to my pond, killed all my fish over night, 6 years same set up, only thing i changed was the tetra sludge reducer. added to my pond, killed all my fish over night, 6 years same set up, only thing i changed was the tetra sludge reducer.

Date published: 2015-05-24

Is this safe for my dogs if they drink from the pond? 

Asked by: KweeniandJoey

This is an enzymatic product, and it slowly dissolves over a period of a month, so yes, as long as they don't get it and eat the entire thing, it's fine. Keep in mind, pond water can harbor various bacteria and protozoa that can affect your dogs, however. BREX

Answered by: BREX

Date published: 2018-05-09

How do I get SDS forms for your products. We have some of your products here. Sludge Reducer-16398-900,UPC 04679816398 5,Aqua Rem Water Clarifier, WL #16397, UPC-04679816397 8, Koi Vital, WL 16395, UPC 04679816395 4, Aqua Safe ,WL 16267, -UPC 04679816267

Asked by: Rose S

Email techsupport.tetra-fish@spectrumbrands.com so the Care Team will have your email address to send them to. BREX

Answered by: BREX

Date published: 2017-08-29

My pond was cleaned thoroughly and a month later I cant see the fish . It is in the sun i have plants in there . Started with pond block 4 with my 1000 gal. A week later for sludge remover blocks and I do have barley pellets at the waterfall. No impovemen

Asked by: LouiseAW

Cleaning the pond completely means removing all of the biological filter and it has to re-establish one. Also, Pond Block should not be used with live plants so the plants probably are not doing much at this point. Test your water quality to see what is off, and add a bacterial supplement/treatment. You don't mention any equipment such as filters or UV lights, etc. You may need to add some of these to help clear the pond. BREX

Answered by: BREX

Date published: 2017-07-28

Product says one block for each 250 gallons of water, since I have small pond and around 80-100 gallons of water do I use half a block. Thanks

Asked by: trapper

You would use about 1/4-1/3 if you can cut it into that size. Always better to under dose something like this, then over dose. BREX

Answered by: BREX

Date published: 2017-06-27

Can you use this product in a pond with fish and with existing algae?

Asked by: Lise

Yes, that's fine. It helps to break down sludge, it does not help remove algae. BREX

Answered by: BREX

Date published: 2017-06-21

How many gallons does a packet treat ?

Asked by: koizilla keeper

One package treats a 1000 gallon pond. BREX

Answered by: BREX

Date published: 2017-05-11

Q1: Where do we place it, inside the pond? Q2: we have a pump & filter system outside the pond... Will it help with the clearing of sludge from the tank where the filters are, or should I place a block there as well?

Asked by: giorgio92

Yes, it goes directly into the bottom of the pond. No, it will not help remove the sludge from your filter systems. That has to be manually removed. BREX

Answered by: BREX

Date published: 2017-05-05

How frequently does one use this.

Asked by: Dale Hagen

Generally, once a month. If the water is really soft, however, you may find it dissolves more quickly. In this case, do a partial water change, and if it is still soft, buffer the water with baking soda or pond salt. BREX

Answered by: BREX

Date published: 2016-06-23

Sludge Reducer Questions - page 2

Sizes Available

Is this safe for my dogs if they drink from the pond?&nbsp;

How do I get SDS forms for your products. We have some of your products here. Sludge Reducer-16398-900,UPC 04679816398 5,Aqua Rem Water Clarifier, WL #16397, UPC-04679816397 8, Koi Vital, WL 16395, UPC 04679816395 4, Aqua Safe ,WL 16267, -UPC 04679816267

My pond was cleaned thoroughly and a month later I cant see the fish . It is in the sun i have plants in there . Started with pond block 4 with my 1000 gal. A week later for sludge remover blocks and I do have barley pellets at the waterfall. No impovemen

Product says one block for each 250 gallons of water, since I have small pond and around 80-100 gallons of water do I use half a block. Thanks

Can you use this product in a pond with fish and with existing algae?

How many gallons does a packet treat ?

Q1: Where do we place it, inside the pond? Q2: we have a pump &amp; filter system outside the pond... Will it help with the clearing of sludge from the tank where the filters are, or should I place a block there as well?

How frequently does one use this.

Is this safe for my dogs if they drink from the pond?

Q1: Where do we place it, inside the pond? Q2: we have a pump & filter system outside the pond... Will it help with the clearing of sludge from the tank where the filters are, or should I place a block there as well?