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How do I use Dishwashing Tabs?Updated 5 hours ago

TL;DR: Use one whole Dishwashing Tab per wash. Drop it straight into the detergent dispenser for normal, auto, and eco cycles (don't unwrap the PVA film, it dissolves in water). For quick or 30-minute programs, skip the dispenser and lay the tab flat on the tub floor under the lower spray arm. Never cut, break, or unwrap them, the dose is pre-measured and the film keeps it stable until water activates it. Works the same way in full-size, compact, and drawer-style dishwashers.

Last reviewed: April 2026

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Koh Dishwashing Tabs review

Can I cut or break the tablets?

No. Each Dishwashing Tab is pre-measured for one full wash, and cutting it breaks the balance between the oxygen bleach, enzymes, water softeners, and dispersants. Half a tab means half the softener (spotting on glass) and half the bleach activator (stains remain). You also risk gritty residue on dishes and undissolved detergent clogging the dispenser. Don't unwrap the tab either, the PVA film is water-soluble and designed to dissolve at the right moment. It also protects your skin from direct contact with concentrated detergent.

⚠ Don't do this

Don't cut Don't break Don't unwrap Don't handle with wet hands

Where should I put the tablet?

Placement depends on the cycle. For normal, auto, and eco cycles, drop the tab straight into the detergent dispenser and close the flap. The dispenser opens mid-wash so the detergent releases at the right moment. For quick or 30-minute programs, the cycle may end before the dispenser opens or before the tab fully dissolves. Skip the dispenser and lay the tab flat on the tub floor, centred under the lower spray arm. If you're running an eco low-temp cycle and still seeing residue, try tub-floor placement there too. In drawer and compact dishwashers, follow the same rule: dispenser for standard, tub floor for quick.

Normal / Auto

Straight into the detergent dispenser. Close the flap. That's it.

Dispenser

Quick / 30 min

Tub floor, flat, centred under the lower spray arm.

Tub floor

Eco (low temp)

Start with dispenser. If residue appears, switch to tub floor.

Dispenser first

How should I load the dishwasher?

Loading matters more than most people realise. Spray arms need clear paths to every dish: no nesting bowls inside bowls, no plates packed so tight the water can't flow between them, no tall items blocking the top arm, no cutlery packed handle-down with no gap. Scrape off large food scraps (not rinse, just scrape), place bowls and cups facing down on the top rack, and stand plates between the tines on the bottom rack. Face dirty surfaces toward the centre where the spray arm hits hardest.

✓ Loading checklist

1

Scrape, don't rinse. Modern dishwashers need some food for the enzymes to grip onto. A quick scrape is enough.

2

No nesting. Bowls, cups, and spoons need space or they'll shield each other from the spray.

3

Face dirty side down and in. Dirty surfaces toward the spray arm, not the walls.

4

Dry hands only. Wet fingers start the PVA film dissolving before the tab hits the dispenser.


What if dishes are still cloudy or spotty?

If glassware comes out cloudy or spotted, it's usually hard water, not the tab. Try these in order; First, check the rinse-aid reservoir and top it up, Dishwashing Tabs do most of the work but rinse aid helps water sheet off glass cleanly in hard-water areas. Second, run a hotter cycle (eco cycles can struggle in very hard water). Third, move the tab to the tub floor if you're on a quick or eco cycle. Fourth, check the salt reservoir if your dishwasher has one and refill with dishwasher salt. If dishes look dull and chalky all over, you likely have hard water that needs ongoing rinse aid plus salt. If it's just a few spots, it's usually a loading issue.


How should I store them?

Keep the pouch sealed when you're not using it. Store in a cool, dry place, away from direct sunlight and the kitchen sink or dishwasher (steam and splashes start the PVA film dissolving). Handle tablets with dry hands only. Unopened, they're shelf-stable for at least 12 months.


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