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Buy one exact-fit pack before buying in bulk
Start with the original-brand refill made for your exact trap. Try a small pack first. Consider a generic only when its seller clearly names your model and shows the shape, size, and fitting points. A cheap pad is poor value if the tray will not close.
For a working Katchy Original or Midnight, the eight-pack below is a useful starting point. Skip more refills if the fan has stopped, the housing is broken, or mosquitoes keep biting while the trap fills with other bugs. A fresh board cannot fix those problems.
Your trap works, you know the exact model, and the old board needs a swap.
Your main problem is open screens, standing water, or a trap that does not suit the pest.
Glue traps can add some indoor capture. They are not a promise of bite-free sleep. AMCA warns against relying on traps alone; results vary with mosquitoes and conditions.
Source: AMCA mosquito trap guidance.
Original, generic, and loose sheets have different trade-offs
| Refill type | Why buy it? | Main drawback | Best fit |
|---|---|---|---|
| Original-brand, exact model | A clear match to the maker’s system | May cost more per pad; still check the version | First refill order or a shaped cartridge |
| Model-specific generic | May lower repeat costs | You must check fit, seller details, and return terms | A known model after a small trial pack |
| Loose sticky sheets | Useful where the product directs their use | Not a ready-made electrical-trap cartridge | Separate insect monitoring, not an assumed refill swap |
| Large multipack | Fewer orders for several working traps | Locks money into one fit and more stored pads | Only after you know your actual use rate |
“Compatible with” means a seller claims fit. It does not mean the trap maker made the refill. Also, a logo alone does not show that two generations use the same part. Compare the full model name, not just the brand.
There is no reason to pay extra for a vague “mosquito power” claim. Ask what is different: a shaped frame, a pull tab, a larger usable surface, or just more pads. Those are things you can check before paying.
Our original-brand pick for Katchy Original and Midnight
Katchy Original and Midnight Glue Board Refills, eight-pack
Buy if: you already own a matching trap and want the maker’s refill. The reason to choose it is the clear model match and original-brand seller. Paying more does not guarantee better catch rates.
The Amazon listing identifies eight boards and has a separate Duo option. Choose the Original/Midnight-compatible version for those traps. Read the selected model and pack size again before checkout: some description text on the shared listing refers to the Duo machine rather than these refills.
Pros: a named model match, a manageable first pack, and no need to choose a loose sheet by eye. Cons: recurring waste and cost; it will not repair a failed trap or stop new mosquitoes entering.
Skip if: you own a Duo or another brand, cannot identify your trap, or need a complete machine. Do not buy this pack just because another trap also uses a round pad.
Check the Katchy eight-pack on Amazon →
Check the selected size, model, seller, delivery, and return terms before ordering.
See our Katchy Original product page for how the complete trap fits into an indoor plan. These are replacement boards, not a trap-and-refill bundle.
Check the model before measuring the pad
Take a photo of the device label, old refill, and empty holder. Save the model number in your shopping notes. Then compare width, length or diameter, edge shape, tabs, and the way the holder closes. Check whether the listing size describes one pad or the whole package.
A round board and a curved cartridge are different parts. A near match can still leave a pad bent or a frame unlatched. Do not force the holder shut or alter the housing to make a bargain refill work.
Zevo shows why the full model name matters. Its Full Size and Max devices take one refill family. Compact and Plant devices take another. The brand’s current packaging uses a purple lock for Full Size/Max and a green lock for Compact/Plant. Check the written model match as well as the color.
Source: Zevo model and package guide.
Compare the official Full Size/Max refill description and Compact/Plant refill description if you own one of those devices. These are fit references, not picks for a new mosquito-control system.
For older gear, ask support using a photo of the label. Do not let a listing’s long list of brands stand in for a match to your own model.
Budget per usable refill, not per room size
Use $10–$25 for a small pack of flat pads and $10–$30 for a small pack of shaped cartridges as rough planning allowances. These are not live prices or quotes for the pick above. Pack counts, shipping, tax, and device fit can change the total a lot.
For a fair comparison, divide the delivered pack cost by the number of usable refills. Then multiply by how many your own traps use. A large pack saves nothing if most pads are the wrong size.
| Example | Math | Planned refill cost |
|---|---|---|
| One trap, one pad per month for six months | 6 pads × $2 per pad | $12 of pads used |
| Two traps at the same use rate | 2 × 6 × $2 | $24 of pads used |
| Two traps using two pads per month | 2 × 6 × 2 × $2 | $48 of pads used |
| Eight-pack costing an assumed $16 | $16 ÷ 8 | $2 per usable pad; $16 paid upfront |
The change rate above is an example, not a promise that a pad lasts a month. Follow your model’s directions and check its condition. If you need 12 pads sold only in eight-packs, you buy 16: two $16 packs would mean $32 upfront, with four spare pads.
A 120-square-foot bedroom and a 300-square-foot kitchen do not need different-size refills for the same trap. Room layout may affect trap placement, but the device sets refill fit. Do not buy a second trap just to use leftover pads.
Skip a subscription until you have tracked at least a few changes. Write down the date, trap location, and reason for each swap. That is a better ordering plan than an automatic monthly box.
Replace worn glue; do not try to wash it fresh
Look for a crowded or dusty glue surface. Follow the model’s replacement advice. Zevo says its cartridges are single-use, and newer models may blink after six weeks as a reminder to inspect them. That light is not a measurement of how much glue remains.
Do not wash, oil, spray, or coat a used cartridge with fresh glue. Store unused refills cool, dry, and out of sunlight. Leave protective covers in place until use.
Source: Zevo refill care and reminders.
A washable outdoor catch net is a different part. Use our catch-net cleaning and replacement guide for that choice. Do not carry a net-cleaning rule over to an indoor adhesive pad.
Install the refill without changing the trap
- Check the exact device instructions and unplug it before opening its holder.
- Remove the old board by its handling edge or tab. Keep the sticky side away from skin, fur, and fabrics.
- Check for debris or damage. Clean only the parts and in the way the device maker allows.
- Remove the new board’s protective liner as directed. Seat it flat, facing the correct way, without covering working openings.
- Close the holder fully. Reconnect the trap and check that it operates as expected.
If the pad buckles, a tab is missing, or the cover does not close, stop. Compare it with the old part before peeling another board. Keep the packaging and ask the seller about a return.
Place the device and spare glue out of reach of children and pets. Keep indoor electrical traps away from wet locations. Do not leave spare sticky sheets loose on a counter or floor.
An EPA establishment number is not a seal of proven mosquito protection. It identifies the production site; devices do not go through the same registration process as pesticide products.
A full board does not prove fewer mosquito bites
Pause before buying a bigger pack if the trap catches many tiny flies but you still get bitten. A mixed catch does not tell you how well the device is controlling mosquitoes. Check what is on the board and where the insects appear.
If they gather around wet potting mix, consider fungus gnats. University of Maryland Extension links these gnats to damp soil and suggests changing watering practices and using yellow sticky cards for monitoring. A houseplant card serves that job; it is not automatically a refill for an electric trap.
Source: University of Maryland fungus gnat guidance.
If the board stays empty, check the liner, seating, power, light, and fan where fitted. Follow placement directions. A trap hidden behind a curtain has a different problem from a full glue board. Test a change in placement before ordering several more packs.
If mosquitoes keep coming in, CDC recommends repairing screens, keeping doors closed, and removing water from containers each week. Our window AC sealing guide and screen repair guide help with entry gaps.
Source: CDC home mosquito control.
Choose the next tool for the problem that remains
One mosquito you can see: a handheld tool may suit the job better than changing an empty pad. Our electric swatter product page explains that format, and the swatter buying guide covers the trade-offs.
A dark sleeping space: compare bed nets and screen repairs if the trap’s glow or fan keeps you awake. Refills will not change the machine’s light or noise.
A trap that never met your needs: review the indoor bedroom trap guide before replacing the whole device. Include spare pads in the total budget, not just the starter price.
Still unsure what to buy: use the mosquito-control product finder to compare the control method that fits your remaining problem. A refill order makes sense only when the trap itself is worth keeping.
Still choosing the device? Compare Zevo and Katchy for mosquitoes by placement, refill budget, and the limits of light traps.
Considering one device for air cleaning and insect capture? Our air purifier versus mosquito trap guide compares separate and combined units, room size, noise, refills, and the limits of each job.
Glue-board refill buying questions
Should I buy original or generic glue-board refills?
Start with the original-brand refill for your exact model if fit is uncertain. Consider a model-specific generic only after checking its shape, dimensions, fitting points, and return terms. Try a small pack before buying in bulk.
Which Katchy refill is the pick in this guide?
The Katchy Original and Midnight eight-pack, ASIN B07GKG19MV. Confirm the selected Original/Midnight-compatible version and eight-board pack. The listing has a separate Duo option and some mixed model text.
Do all Katchy traps take the same glue board?
Do not assume so. Match the exact trap to the selected refill. A separate Duo option on a shared listing is not proof that the Original refill fits it.
Do Zevo Full Size refills fit Compact traps?
No. Zevo groups Full Size with Max, and Compact with Plant. Check the written compatibility on the refill pack and the device label.
Are more expensive pads proven to catch more mosquitoes?
A higher price alone does not prove better mosquito capture. Pay for a confirmed fit and useful handling features, and judge whether the complete trap meets your needs.
How often should I replace a sticky board?
Follow the device instructions and inspect the glue. Replace a board that is crowded, dusty, or no longer usable. Do not assume every model or room has the same change schedule.
Can I wash and reuse a Zevo cartridge?
No. Zevo says its adhesive cartridges are single-use. Do not wash or recoat them. A washable catch net is a different kind of trap part.
Does a blinking Zevo light mean the cartridge is full?
Not necessarily. On models with the reminder, Zevo describes a six-week timer that prompts a check. Inspect the cartridge rather than treating the light as a fullness sensor.
Can I cut a plant sticky card to fit my electric trap?
Do not assume that is an approved refill. Check the trap instructions for the exact replacement part. A loose card does not provide the frame, tabs, or fit of a shaped cartridge.
How many refills should I order for two traps?
Use your actual change rate. If each trap uses one pad a month, six months needs 12 pads. Round up to whole packs and include shipping and tax in the budget.
Does a bigger room need a bigger refill?
The trap model sets refill size. Room layout may affect where a trap works, but a larger pad will not turn a small device into a whole-home mosquito system.
Why is the new pad not catching anything?
Check for a liner left on, poor seating, a power fault, or a placement problem. Also check the insect type. More pads will not fix a broken fan or the wrong control method.
Why am I still bitten when the board is full?
It may contain other insects, and a trap does not stop new mosquitoes entering. Check screens and water-holding containers. Do not use a full glue board as proof of bite protection.
Can I spray repellent or add oil to the glue?
Do not alter the adhesive. Use the refill as directed and put any approved bait only where the exact device instructions say it belongs.
How should I store spare cartridges?
Keep them cool, dry, and away from sunlight. Leave protective covers in place until use and keep the packs away from children and pets.
When should I replace the trap instead of the refill?
Consider service or replacement if the device is damaged or no longer operates. If it works but fails to solve your problem, check entry points and pest identity before buying another machine.