Model # ZLST648

Internet #100010585

Store SKU #338375

ZEP 64 oz. Septic System and Cesspool Treatment


64 oz. Septic System and Cesspool Treatment

  • Helps prevent septic backup by dissolving organic material
  • Bacterial enzymes digest paper, grease, proteins and more
  • Septic and cesspool treatment that's safe for all plumbing
$849 /each
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Frequently Bought Together

Product Overview

ZEP 64 oz. Septic System and Cesspool Treatment contains a non-toxic formula with concentrated natural enzymes that help dissolve organic material buildup in your septic tank and field lines. It can be used monthly as a preventive maintenance measure.

  • Septic system, cesspool and pipe cleaner
  • Non-toxic formula contains concentrated natural enzymes that break down organic materials in septic tanks
  • Prevents septic system backup
  • Childproof cap
  • Up to 2 treatments per container

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Chemical Form
Commercial / Residential
Commercial / Residential
Compatible Pipe Material
Maintenance, Repair & Supplies Product Type
Drain Openers & Chemicals
Number of treatments per container
Prevention formula
Protects pipes from corrosion
Quantity (oz.)
Safe for garbage disposals
Set Time (Min.)
Type of Issue

Warranty / Certifications

Manufacturer Warranty

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Customer Questions & Answers

Can this be used in a cesspool, not a septic tank?

I successfully used a powdered product made by another company that is no longer sold in Home Depot. Can this be used as a preventative for a 50 year old cesspool that has never had any problems to date?
Asked by: Dave
Yes, it can be used on either type of waste treatment system
Answered by: LosRubios
Date published: 2015-11-25

When I pour Zep in toilet tank do I flush toilet or let Zep sit in tank?

Asked by: CT
You'll want to flush. ZEP is an enzyme and bacteria combination that needs "food" to work. If your toilet is sluggish or totally clogged, then letting it sit in the tank might be beneficial (I would still use a snake to try to get some water flow. Then use a bucket to slowly pour water into the tank and try to get the solution down toward your clog.)
Answered by: JF2016
Date published: 2017-05-28

Label says Septic, Cesspool and pipe cleaner. Septic line pipes or regular clogged pipes?

Asked by: lyn25
Zep Septic System and Cesspool Treatment would be to assist with septic pipes. If you are looking for a clog remover for interior drains, we would recommend looking at one of our drain openers such as our Professional Strength Drain Opener, 10 Minute Hair Clog Remover, Liquid Heat or Crystal Heat.
Answered by: Zep Customer Support
Date published: 2016-05-03

can this product be used in a rv waste tank

is this product the same as rv tank system.
Asked by: chomper
Yes, you can use it in a grey water tank in an RV or a boat as it is compatible with different types of plumbing material like PVC etc.
Answered by: LosRubios
Date published: 2015-11-25
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Customer Reviews

64 oz. Septic System and Cesspool Treatment is rated 4.4 out of 5 by 11.
Rated 5 out of 5 by from Quickly melts organic materials I used this for a completely different purpose than it is advertised for, but it worked like a charm. I had an elderly pet that had many "accidents" on my carpeting. The stain and odor were embedded into the fibers and there was still a lot of "organic matter" stuck to the material. I moistened the waste with this solution at full strength, allowed it to soak for 4 hours and then used a carpet steamer - shampooer over the areas. The solution had dissolved the waste material, allowing it to be vacuumed up into the carpet cleaning machine and leaving the entire area looking clean and smelling fresh. The enzymes in this work better for this purpose than any of the solutions sold in pet stores for clean-up. Because it works so well on organic material, I would hesitate to use it on wool or cotton-fiber carpets, but it did wonders on my synthetic blends.
Date published: 2016-08-16
Rated 5 out of 5 by from Easy to use, effective and non toxic We switched to the ZEP liquid septic tank treatment after using the powdered variety of septic tank treatment. The ZEP liquid is very simple to use, you just pour it in the toilet bowl and flush it down and it starts its job of breaking down the contents of the septic tank. No residual powdery mess in the toilet bowl, just one flush and its gone. There's enough fluid to treat 1,000 gallons so if you have a 500 gallon septic tank, there's enough for two treatments here. We normally treat our septic tank once every 2-3 months as needed. It is compatible with virtually all types of plumbing and most importantly, it is non toxic according to the material safety data sheet.
Date published: 2015-11-24
Rated 5 out of 5 by from Reasonably priced alternative I have a septic system and large family which means I need to keep my system healthy and working efficiently. I have used powdered alternatives in the past to treat my septic. But I always disliked the power dust cloud that came with their use. This is a liquid form. Simply pour into the toilet, flush and done. No powder cloud to inhale. Easy to use. The bottle says it will last for 2 monthly treatments.
Date published: 2015-11-14
Rated 1 out of 5 by from Does not work Used 4 bottles over a 2 month period and not even a tiny bit of improvement in a cesspool
Date published: 2016-05-27
Rated 5 out of 5 by from Preventative Maintenance This is a good way to keep yourself from dealing with a septic tank back up. Just a few bucks and under a minute's worth of work for saving myself that trouble is well worth it in my book. Application is very easy - just flush it down the toilet. I flushed half down one toilet, and half down the other. It's supposed to be safe for all plumbing types too, so no worries figuring out if you've got cast iron, PEX, ABS, or PVC. The jug holds 64 oz of treatment, which is enough for a 1000 gallon septic tank. If you've got a 500 gallon tank, it will last for two applications. There's a press-and-turn child proof cap for storing the rest safely, and there's also a tamper evident safety seal under the cap. The jug pours well too - no drips ran down the side at all. There's a faint bit of odor, but it doesn't really smell much at all.
Date published: 2015-11-20
Rated 5 out of 5 by from Preventative treatment This advertises as a non-toxic formula that won't harm pipes. It is a large 64 oz. container, good for two treatments. Directions state flush down toilet every two months (32 oz. for a 1000 gallon septic tank.) The bacterial enzymes break down grease, paper, fats, proteins, and starches which will protect your system from backing up due to clogs. It is very expensive to dig a new drainfield so this product is worth buying.
Date published: 2015-11-10
Rated 5 out of 5 by from Hmmm,,what to say about that! I mean this is a tough review to write. I have been using septic treatment for years. You add one half of a bottle of this product to your toilet water and flush. From there if everything is working right you never have to deal with a backed up septic system. Been there, done that and it really is not something you want to happen. So use this product every two months and that should prevent any trouble.
Date published: 2016-01-06
Rated 4 out of 5 by from Good product Good product that is easy to use. Bottle was large and easy to pour. Product is easy to use, Just pour the correct amount into the toilet bowl and flush. It's that easy. Product is a nice blue color. Only time will tell if the product works according to the claims on the label. The product seemed to have a good quality about it. I would recommend to any home owner with a septic tank.
Date published: 2015-09-21
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