The single biggest lever on parts washer running cost is the filter. Cleaning fluid doesn’t really wear out — it gets dirty. It loads up with metal fines, shop dirt, and sludge that slow cleaning down and push you into an early fluid change. Choose the right parts washer filter, change it on a schedule, and you will clean better while stretching every gallon of solution you buy.
Why the filter matters more than the machine
As you clean parts, contaminants build up in the tank. Left unfiltered, that debris recirculates straight back onto the next parts, clogs pumps and nozzles, and drags down cleaning power — so you dump and refill far sooner than you should. A filter traps the debris before it settles, which keeps the solution working and cuts both your chemical spend and your hazardous-disposal bill. It is the cheapest upgrade you can make to a washer you already own.
Types of parts washer filter
- Filter elements — cartridge-style filters that capture fine particles as the fluid recirculates. The everyday workhorse in most recirculating washers. Build-All stocks replacement filter elements in ten-packs so you always have a spare on the shelf.
- Clay bag filters — these do double duty. They screen particulate like a standard bag, but the clay media also absorbs dissolved oils and grease that a plain filter passes straight through. If your solvent is going dark and greasy rather than gritty, a clay bag filter is what you want.
- Drain screens and crumb cups — the first line of defense. They catch chips, hardware, and shop debris before any of it reaches the pump. A drain screen crumb cup costs almost nothing and protects the most expensive part of the machine.
- Complete filtration systems — if your washer came without filtration, or the setup you have is not keeping up, a full parts washer filtration system adds proper filtration to the recirculating loop.
What micron rating do you need?
Micron rating is simply how small a particle the filter will catch. Lower number means finer filtration. The trade-off is real: a finer filter gives you cleaner solution and better cleaning results, but it loads up faster and restricts flow sooner, so you change it more often.
- Coarse (roughly 50 micron and up) — heavy castings, weldments, and dirty teardown work where you are moving a lot of bulk debris and do not want to blind a filter every week.
- Medium (roughly 20–50 micron) — the general shop range, and where most parts washing lands. Our 40-gallon aqueous units run 20-micron filtration for exactly this reason: it pulls the grit out without choking on it.
- Fine (under 20 micron) — precision work, hydraulic and fuel-system components, or any part heading straight into an assembly where a stray particle is a warranty claim.
If you are not sure, start in the middle. Run a 20-micron filter, watch how fast it loads, and adjust from there. That is far more reliable than guessing off a spec sheet.
When to change a parts washer filter
There is no universal interval — it depends entirely on how dirty your parts are and how hard you run the machine. Change the filter when you see any of these:
- Flow out of the nozzle or brush noticeably drops off
- The pump starts working audibly harder
- Parts come out of the wash still carrying a film
- The element is visibly loaded when you pull it
A shop running dirty engine teardowns might change weekly. A shop cleaning light machined parts might go a month or more. Check it weekly, change it when it tells you to, and keep spares on hand so a loaded filter never becomes a reason to skip the change.
A simple maintenance routine
- Daily: skim floating debris, empty the crumb cup, and wipe the work surface.
- Weekly: check the filter and replace it when flow slows or the element is loaded.
- Monthly: inspect the pump, nozzles, and heater; confirm the solution is holding temperature (heat is what makes an aqueous washer clean well).
- As needed: test cleaner concentration and top up rather than dumping the whole tank.
How filtration saves money
A washer with good filtration and a light maintenance habit can run the same fluid many times longer than one without. That means fewer chemical purchases, less hazardous waste to haul, and cleaning results that do not quietly degrade over the month. The filter is the cheapest line item on the machine and the one with the most leverage.
Keep clean parts from flash rusting
One thing shops miss: a part that comes out of the washer clean is also a part with no oil left protecting it. Freshly cleaned steel will flash rust faster than the dirty part you started with, especially in humid months. Our sister company Solvent Recycling Systems distributes Cortec VpCI corrosion-control products that protect parts between the washer and the next operation.
Get the right filter for your washer
Not sure which filter fits your machine? Browse Build-All filtration options, or see the equipment itself in our parts washer video library. If you are still choosing a washer, start with our guide to choosing the right parts washer. We have manufactured parts washing equipment in Milwaukee, Wisconsin for over 50 years — tell us your machine and we will tell you what fits. Contact us.