How often should I clean my pond filter?

It depends on the type. Self-cleaning units like the Oase BioTec ScreenMatic2 rinse themselves automatically and only need a deeper cleaning a couple of times a season. A manual filter or skimmer basket should get checked weekly during spring and summer, and more often during fall leaf drop.

What's the difference between a skimmer and a bottom drain?

A skimmer pulls debris off the water's surface before it sinks. A bottom drain removes waste that has already settled on the pond floor. Ponds with fish, especially koi, generally benefit from having both.

Do I need a UV clarifier if I already have a filter?

A filter and a UV clarifier do different jobs. Filtration removes physical debris and processes waste biologically, while a UV clarifier clumps free-floating algae so your filter can trap it. If green water is a recurring problem, a UV clarifier like the Aqua Ultraviolet 'Twist' Series usually solves what filtration alone can't.

How do I know what size filter my pond needs?

Match the filter's rated flow capacity to your pond's total gallons and your pump's actual flow rate in gallons per hour. An undersized filter processes water too fast for the biological media to work properly, which shows up as cloudy or green water even though the filter is technically running.

Can I use tap water to rinse my biological filter media?

Avoid it. Chlorine and chloramine in tap water kill the beneficial bacteria colonies living in the media. Rinse filter media in a bucket of pond water instead, and only rinse enough to knock off heavy sludge, not scrub it clean.

What should I do if I find a leak in my pond liner?

Patch small tears and punctures as soon as you spot them with an EPDM repair kit and primer, like the Firestone EPDM Pond Liner Repair Kit. Waiting lets a small tear widen, and low water levels stress fish and strain your pump.

When should I start dosing beneficial bacteria in spring?

Start as soon as water temperature holds above roughly 50°F and you've restarted your pump and filter for the season. Dormant bacteria colonies need to be reestablished before bioload builds up as fish become more active and feeding increases.

Do pressurized filters need less maintenance than screen filters?

Pressurized filters like the Oase filtoclear or PondMax Pressurized filter still need periodic backwashing or media rinsing, but because they're sealed, they don't collect surface debris the way an open screen filter does. Self-cleaning screen filters like the BioTec ScreenMatic2 reduce manual cleaning the most, since the rinse cycle runs on its own.

Cleaning & Maintenance

Pond cleaning and maintenance supplies cover everything that keeps your pond's water clear and its equipment running once the initial build is done. This part of our shop holds the gear you reach for on a regular basis: filters and skimmers that pull debris out of the water, UV clarifiers that knock back green water, cleaning solutions for pumps and rock work, vacuum heads for gravel, beneficial bacteria to keep your biological filter working, and liner repair kits for the day something tears.

If you've got a backyard koi pond in the Puget Sound area, or anywhere with four real seasons, most of what's listed here gets used at least once a year. We carry gear from Oase, Aquascape, EasyPro, Firestone, Matala, Atlantic, and Aqua Ultraviolet, so you're choosing based on what your pond actually needs rather than what one brand happens to sell. Scroll down for a breakdown of what each type does and how to pick between them.

Pond Cleaning & Maintenance: A Buyer's Guide

What Belongs in This Category

A pond cleaning and maintenance category holds the products a pond owner buys after the pond is already built and running. That's different from construction gear like liner and plumbing, and it's different from fish food and medication. Here it splits into five groups: mechanical filtration and skimmers, biological filter media and bacteria, UV clarifiers, cleaning tools and solutions, and liner repair kits.

Mechanical Filtration and Skimmers

We carry the Oase BioTec ScreenMatic2 in three sizes, the 18000, the 24000, and the 39000. These are self-cleaning screen filters that rinse debris off the mesh automatically, so you're not pulling a basket every few days. On the pressurized side there's the Aquascape UltraKlean Pressurized Biological Pond Filter, a sealed unit that handles mechanical and biological filtration in one housing and works well when you don't want a big open filter box sitting next to the pond. For pulling debris off the surface before it sinks, the EasyPro Pro-Series Pond Skimmers do that job. The EasyPro 3" Bottom Drains handle the opposite end, pulling settled waste off the pond floor before it has a chance to sit there and rot.

Biological Filtration Media and Bacteria

Filtration only works if the bacteria living inside it are healthy. Savio Springflo Biofilter Media gives those bacteria surface area to colonize inside a filter. Aquascape Beneficial Bacteria Concentrate and Aquascape Cold Water Beneficial Bacteria get dosed directly into the pond, with the cold water version formulated to keep working in temperatures where standard bacteria slow down or go dormant.

UV Clarifiers

The Aqua Ultraviolet 'Twist' Series UV Clarifier sits inline with your pump and filter and uses UV light to clump free-floating algae cells together so your filter can catch them. It doesn't replace filtration. It makes the filtration you already have more effective against green water.

Cleaning Solutions, Scrubbers, and Vacuum Tools

This is the hands-on side of the category. Atlantic Foam Gun Cleaner breaks down the pond foam sealant used around rockwork and plumbing joints, which is handy mid-repair rather than during a full teardown. AquascapePRO Waterfall & Rock Cleaner is a professional-grade dry cleaner for stripping algae and mineral buildup off waterfall rock without draining the whole system. Aquascape Clean for Fountains is a lighter pump-top solution built for smaller fountain basins. Aquascape Pump Cleaner Maintenance Solution soaks impellers and pump housings clean of the scale and gunk that slows pumps down over a season. The Matala Gravel Vacuum Head attaches to a standard vacuum setup and is built specifically for pulling debris out of gravel and rock beds without disturbing everything around it. Firestone Quick Scrubber & 2 Pads is a simple hand tool for scrubbing algae off liner and rock by hand, for the jobs where a power tool is overkill.

Liner Repair

The Firestone EPDM Pond Liner Repair Kit with Primer patches tears and punctures in EPDM rubber liner, the material most backyard ponds are built with. It's worth keeping one on hand even if you've never had a leak. When you do find one, you want to patch it that day, not order a kit and wait.

Choosing Between Filter and Skimmer Types

Most of the questions we get from pond owners come down to sizing and fit, not brand preference. Here's how the main types stack up against each other.

Screen Filters vs. Pressurized Filters

The BioTec ScreenMatic2 line and the UltraKlean Pressurized filter solve the same basic problem, keeping debris and waste out of your water, but they fit different setups. A ScreenMatic2 sits in an open filter box, usually built into the waterfall or streambed, and its self-cleaning screen means less manual maintenance on a pond with heavy leaf or debris load. The UltraKlean is a sealed pressurized unit, which means it can sit below water level or even underground and still push filtered water uphill to a spillway. If you've got the space for an open filter box and want easy access for occasional cleaning, go with a screen filter. If you're tight on space or want the filter tucked out of sight, pressurized is the better fit.

Skimmers and Bottom Drains

A skimmer catches debris before it sinks. A bottom drain catches what already sank. Most ponds do better with both rather than picking one, since leaves and grass clippings don't all get skimmed off the surface before they settle. If your pond has koi, bottom drains carry extra weight, because fish waste settles the same way and needs a path out of the pond, not just off the top.

Key Factors to Weigh Before You Buy

Pond Size and Flow Rate

Filter and skimmer sizing needs to match your actual pond volume and pump flow rate, not just the general size of the pond. An undersized filter run at too high a flow rate won't give the biological media enough contact time to do its job. Check the flow rate rating on any filter, such as the ScreenMatic2 sizes that scale from 18000 up to 39000, against what your pump actually pushes before you buy.

Fish Load

A heavily stocked koi pond produces a lot more waste than a lightly stocked water garden with a few goldfish, and that changes what you need. More fish means more beneficial bacteria to keep ammonia and nitrite in check, more filtration capacity, and a bottom drain becomes a lot less optional.

How Much Hands-On Maintenance You Want to Do

Self-cleaning screen filters and pressurized filters cut down on manual scrubbing, but they cost more upfront than a basic setup you clean by hand. If you don't mind pulling a filter mat and hosing it off every week or two, you can save money on equipment and put the time in instead. If you'd rather spend less time at the pond, lean toward self-cleaning filtration and UV clarification to stretch the gap between cleanings.

Seasonal Maintenance Guidance

Spring Startup

As water temperatures climb back into the 50s, bacteria populations that went dormant over winter need restarting. This is when Aquascape Beneficial Bacteria Concentrate or the cold water version earn their keep, dosed right as you restart pumps and filters. It's also a good time to check filter media, rinse it in pond water rather than tap water so you don't kill off the colonies still alive in it, and inspect liner edges for winter damage before you need the Firestone repair kit.

Summer Upkeep

Warm water grows algae fast and pushes filtration harder. This is peak season for a UV clarifier to earn its cost, and it's when skimmers and bottom drains need checking most often, since organic debris breaks down faster in warm water and can foul a filter quickly if it sits too long.

Fall and Winter Prep

Leaf drop is the big one. A skimmer working overtime in the fall keeps your filter from getting overwhelmed. Once the season winds down, it's a good time to give rock and waterfall surfaces a real cleaning with something like the AquascapePRO Waterfall & Rock Cleaner before things slow down for winter.