$6.99 Shipping, Free on orders over $59. Exclusions apply. See Details.
Home » Brands » All Brands » Penn-Plax » Penn-Plax Smallworld Filter #SWF-1
Penn-Plax Smallworld Filter #SWF-1

Penn-Plax Smallworld Filter #SWF-1

Item #: 030172390067
Reg: $8.39
Sale: $6.93
You Save: $1.46 (17%)
  • Description
  • Reviews
  • Related Items
Penn-Plax Smallworld Filter removes harmful gases, odors, and discoloration with a disposable, quick and easy filtration unit. For best results, replace filtration unit (#SWF-1C) every 2-4 weeks. Note: Requires an air pump and airline tubing (not included). Dimensions: 4.5" x 1.5" x 1.5".


  • Provides a healthier living environment for your fish
  • Keeps aquarium water looking crystal clear for 2-4 weeks
  • Ideal for small aquariums and fish bowls of any shape


  • Filter unit
  • Filter holder (with suction cups)
  • Air valve
Review Summary
12 Reviews
75% (9)
0% (0)
0% (0)
8% (1)
17% (2)
75% Recommend this product (9 of 12 responses)
By Officer D.
Thanks great
February 4, 2019
Thanks. Great. I love the item that I purchased I look forward to doing business in the near future thanks again and I receive my item quickly
By Kathy
May 2, 2018
Filters make a lot of noise, changed them with sponges
By Candy
Cabot, AR
Still great product after years of production.
November 17, 2016
Works just like I remember from years ago.
By Wendy
great filter
February 3, 2016
I have had my goldfish for 19 years and have used this filter in the tank the whole time. My only problem with it is the suction cups dissolve over time and I have to replace the whole filter and not just the cartridge. I am trying to find replacement suction cups. Petco has stopped carrying this filter and I don't want to change to a different type. I am afraid it will kill the fish. His poor buddy only lived 8 years. Recently saw on a late night show that the longest a goldfish lived was 43 years. He has a long way to go.
By Linda
Good small filter that shows you what it traps
January 29, 2015
This filter cleans as it releases air bubbles into the warer I haven't had problems with suction cups or clousing and think this does a better job cleaning than other small filters I have used. I have it attached to a small Tetra pump because I've replaced my Tetra filter with the Penn Plax disposable system
  • Wish I could replace the filter and charcoal rather than throwing the whole unit out.
By Candice M.
Portland, Oregon
Do not recommend
December 6, 2014
This filter contaminated my fish tank... The directions say to briefly rinse the cartridge before placing it in the tank to prevent cloudiness. I rinsed the cartridge very thoroughly, but each time I placed it in water, it clouded the water so severely that the filter was barely visible!! Definitely not safe for fish.
By Apple J.
filter review
December 4, 2014
no matter how much I rinsed and rinsed the cartridge, it always spewed out junk. I did several tests before placing the filter in my fish tank, and each time the water was completely clouded by the filter. It did nothing to filter the water, and instead made it uninhabitable for aquatic life.
By Peggy H.
Princeton, Ks.
Smallworld Filter
February 2, 2013
I have used these in my small tanks for a number of years.
  • They are small enough for 1 and 1/2 gal tanks and are easy to clean and change.
  • Only problem I have had is that the suction cups on the back seem to degrade faster than the did in the past.
By Ryan
Temple, TX
Smallworld Filter
January 14, 2012
I have used the Penn-plax smallworld filters in smal tanks and fish bowls for some time. They do a very good job of filtering these small tanks. I am glad that I could find some place to contonue getting them.
  • I like their size and efficiency,
  • The suction cups tend to deteriorate over time and I cannot find replacement cups for them thus causing the need to buy new filters from time to time.
By judy
orange park, fl
November 25, 2011
By Paul
Houston, Tx
Perfect for small tank
June 19, 2011
Does a great job of keeping small aquarium water clean.
By Melissa
Skippack, PA
Best filter ever!
May 22, 2011
I've been using this model for years because it works great and you can't beat the price!