Best PreFilters to Buy in October 2025
Honeywell HRF-A300 Air Purifier Pre Kit Filter, 4-Pack - Allergen Air Filter Targets Dust, VOC, Pet, Kitchen, and Wildfire/Smoke Odors
- EXTEND HEPA FILTER LIFE WITH 4 PRE-FILTERS FOR A FULL YEAR.
- PERFECT FIT FOR MULTIPLE HONEYWELL AIR PURIFIER MODELS.
- REDUCE ODORS AND ENHANCE AIR CLEANING EVERY 3 MONTHS.
Honeywell HRF-A100 Air Purifier Pre Kit Filter, 4-Pack - Allergen Air Filter Targets Dust, VOC, Pet, Kitchen, and Wildfire/Smoke Odors
- EXTEND HEPA FILTER LIFE WITH OUR 1-YEAR SUPPLY OF PRE-FILTERS!
- SPECIFICALLY DESIGNED FOR HONEYWELL MODELS FOR OPTIMAL PERFORMANCE.
- REDUCES ODORS WHILE ENSURING EFFECTIVE AIR CLEANING & CIRCULATION.
AQUANEAT 6-Pack Pre-Filter Sponge for Aquarium Shrimp Fry Fish Tank Filter 0.8” Intake, Replacement Foam Cover
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PROTECTS AQUATIC LIFE: PREVENTS BABY FISH AND SHRIMP FROM BEING SUCKED IN.
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ENHANCES FILTRATION: CAPTURES DEBRIS, ENSURING A CLEANER, HEALTHIER TANK.
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DURABLE & REUSABLE: EASY TO MAINTAIN; SIMPLY RINSE AND REUSE FOR LONGEVITY.
HRF-A300 Pre Filter A Replacement for Honeywell HEPA Air Purifier HPA300 Series, Funmit 6 Pack Precut Activated Carbon Pre Filter Compatible with Honeywell Air Purifier Prefilter A
- COMPATIBLE WITH HPA300 SERIES FOR PERFECT FILTRATION.
- HIGH-QUALITY ACTIVATED CARBON FOR OPTIMAL AIR PURIFICATION.
- COST-EFFECTIVE PACK: 6 PRE-FILTERS FOR YEAR-ROUND FRESH AIR.
GLACIER FRESH Garden Hose End Pre-Filter for Swimming Pool, Hot Tubs, Spa, Inflatable Pool, Ponds, Greatly Reduces Bad Taste, Odors, Chlorin and Sediment, up to 8,000 Gallons, 2 Pack
- REMOVES IMPURITIES FOR CLEANER, HEALTHIER WATER-ENJOY PEACE OF MIND!
- FILTERS UP TO 8,000 GALLONS-LONG-LASTING PERFORMANCE FOR ALL USES!
- EASY TOOL-FREE INSTALLATION-CONNECT AND ENJOY PURE WATER INSTANTLY!
8 Pack HPA300 Pre Filter A, HRF-A300 Pre Kit Filter for Honeywell HPA300 Air Purifier, Precut Activated Carbon Prefilter for HPA300, HPA304, HPA3300, HPA5300, HPA8350 Series
- 8-PACK SAVINGS: GET A 2-YEAR SUPPLY OF FILTERS FOR LESS HASSLE!
- ODOR CONTROL: ACTIVATED CARBON ABSORBS PET AND COOKING ODORS EFFECTIVELY.
- EASY INSTALLATION: TAILORED FILTERS FIT PERFECTLY-NO MEASURING NEEDED!
HPA100 Pre-Filters Replacement for Honeywell Air Purifier - 8 Pack - HRF-A100 Filter A Compatible w/ HPA100, 104, 105, 090, 094
- SAVE TIME AND MONEY WITH 8 PRE-FILTERS INSTEAD OF COSTLY REPLACEMENTS.
- QUICK, NO-MEASURE INSTALLATION FOR HASSLE-FREE FILTER CHANGES!
- PREMIUM ACTIVATED CARBON ELIMINATES ODORS, SMOKE, AND ALLERGENS.
Many people confuse a prefilter with a biofilter. It’s easy to do. Those who manufacture prefilters often call them biofilters on the packaging. They shouldn’t be able to get away with it but they do. Prefilters are used in conjunction with submersible pumps to strain large debris so that it won’t get caught up in the pump. They’re often built onto certain pumps or come as optional attachments. We like to construct our own with pump baskets.
For submersible pumps a prefilter is not an option. It should be considered a "must". Leaves and muck can clog the intake area of the pump. Debris and even fish can be sucked up into the pump and cause damage to the pump and, of course, will kill the unlucky fish that happens to get caught in the suction. A prefilter protects your investment in the pump and, in a few cases, the fish.
Quite often someone calls who has a submersible pump and wants to know why their pump has stopped working or why the flow of water is no longer as strong as it was when the system was installed. Nine times out of ten it is that there is no prefilter and the pump is clogged or the prefilter, itself, is in need of a cleaning.
Submersible pumps, whether protected by a prefilter or not, will need cleaning - and during the peak season once or twice a week. This involves reaching down into the water and pulling up the filter along with the filter basket or attached prefilter. Strong blasts from the garden hose usually works fine to clean the prefilter. Without the prefilter you almost have to take apart the pump and remove the debris each time. Now you see why we prefer a bottom drain and outside pump operation - much easier on the back!
If a bottom drain is out of the question you will have to contend with the problems associated with a submersible pump. Cleaning and prefiltering will be the key to keeping the system up and running for years to come.
The most effective prefilter you can place on your submersible pump is one that is coarse enough to allow small dirt and sand particles to travel through the pump and get trapped in the outside biofilter where it is easier to clean. At the same time the material of the prefilter must not allow leaves and larger objects (especially fins of fish) to attach to the water intake of the pump.