About three minutes. No tools. Load one 3-inch bromine (BCDMH) tablet you buy separately, clip on the overflow pipe, connect the refill tube, replace the lid, and flush. Replace the tablet when it’s gone. Holds up to five tablets; each can last up to one year depending on flush frequency and water, for up to approximately five years between full reloads. Flush frequency still matters.

Get rid of toilet bowl ring permanently.

Get rid of toilet bowl ring permanently. Flush Frog cleans your toilet bowl with every flush, helps prevent hard-water stains, and routes cleaner to the bowl instead of soaking tank parts.

Get the Whole-Home 4 Pack — $34.99 See how it works

Up to 1 year per tablet · Holds up to 5 · Up to ~5 years between full reloads. Flush frequency and water conditions matter.
$8.75 per toilet · Free US shipping on 4 Pack · 30-day no-fit · Tablet guide

Get rid of toilet bowl ring permanently — Flush Frog overflow-pipe cleaner

Five-tablet capacity. Cleaner goes to the bowl, not the tank reservoir.

Most homes: the 4 Pack.

4 Pack — Best value

$34.99 · Only $8.75 per toilet · Free US shipping

Four dispensers. Save $24.97 versus four 1-Packs. Tablet not included. 30-day refund including no-fit.

Get the Whole-Home 4 Pack — $34.99

1 Pack — $14.99

Try one toilet. Same dispenser. Tablet not included. 30-day refund including no-fit. Shipping calculated at checkout.

1 Pack — $14.99

Load one 3-inch bromine (BCDMH) tablet you buy separately. Replace it when it's gone. Flush Frog holds up to five standard 3-inch BCDMH tablets. Each tablet can last up to one year depending on flush frequency and water conditions, providing up to approximately five years between full reloads. We do not sell tablets. Which cleaning tablets work with Flush Frog?

Load. Clip. Connect.

Diagram. Load. Clip on overflow. Connect the refill tube into Flush Frog. About 3 minutes. No tools.

1. Load

Load one 3-inch bromine (BCDMH) tablet you buy separately. Details below.

2. Clip

Clip the dispenser on the overflow pipe inside the tank.

3. Connect

Move the refill tube from the fill valve into Flush Frog. Close the lid and flush.

Install — about 3 minutes, no tools

Try it 30 days.

If bowl maintenance isn’t easier, you get a purchase-price refund.

You scrub. Next week the ring is back.

A waterline ring is minerals plus a thin film. Scrubbing takes off what’s there. The next days of ordinary flushes start it again. Tank tablets dissolve directly in the reservoir, leaving tank components exposed to treated water between flushes. The ring you see is in the bowl.

Clean top-down toilet bowl with the message Get rid of toilet bowl ring permanently.

Keep the bowl clean and help prevent the toilet bowl ring from coming back.

Clean the bowl. Spare the tank.

Flush Frog clips on the overflow pipe. A refill tube from the fill valve runs through the dispenser. On each flush, that water picks up cleaner and carries it into the bowl, where it stays and cleans. Flush Frog instead treats the smaller refill stream already headed toward the bowl.

Flush Frog doses the bowl through the overflow path — cleaner goes to the bowl, not soaking tank parts.

Diagram. Clip on the overflow. Refill water is dosed into the bowl, not left soaking the tank.

Flush Frog vs tank tablets

Advantages

Flush Frog works on a similar principle to overflow-tube systems like the Fluidmaster Flush ’n Sparkle, with key differences in how it handles tablets and water routing. Those differences are designed to extend tablet lifetime versus cartridge-style competitors — which means fewer refill trips and cleaner bowls between changes.

Overflow-pipe mounting

Like Fluidmaster, Flush Frog clips onto the overflow pipe inside the tank and connects to the fill valve’s refill tube. That keeps harsh cleaner out of the main tank reservoir, so internal components and rubber flappers are not bathed in treated water between flushes.

Open tablet compatibility

Unlike systems that require proprietary sealed cartridges or replacement pods, Flush Frog holds a standard 3-inch bromine (BCDMH) tablet you buy separately — more flexibility on supplies (we do not sell tablets).

Targeted refill dosing

It intercepts only the smaller stream of refill water heading into the bowl, so active ingredients go where the ring forms instead of dissolving the whole tablet in standing tank water.

Longer tablet lifetime

Tablets sit in a smaller reservoir inside the Flush Frog holder, not the full tank, so they dissolve more slowly. A single tablet can last up to 1 year depending on flush frequency. Stacked tablets are gravity-fed: spares mostly stay above the water until the tablet below fully dissolves — which extends refill intervals versus systems that soak a cartridge continuously.

Lift the lid. Do you see an overflow pipe?

That’s the vertical tube in the tank (also called the overfill pipe). Fits most standard 2-piece gravity toilets. Often no: pressure-assist, some one-piece, RV, some compact Toto/Kohler layouts. If it doesn’t clip, the 30-day refund covers no-fit. Don’t force tank parts.

Labeled diagram. This is the overflow pipe (also called the overfill pipe).

See if it fits

What’s in the box

The clip-on dispenser. Clip and refill-tube path are built in. Device only — no tablet, no tools. 1 Pack = one dispenser. 4 Pack = four. Load one 3-inch bromine (BCDMH) tablet you buy separately — which tablets work.

The Flush Frog dispenser. Tablet you buy separately.

30-day refund. Including no-fit.

If it doesn’t clip, or bowl maintenance isn’t easier, you get the purchase price back. Return shipping is not free. Free US shipping on the 4 Pack. 1 Pack: shipping calculated at checkout. US only. Orders leave in 1–2 business days.

Guarantee Shipping Returns

Short answers

Lift the lid. Do you see an overflow pipe? Fits most standard 2-piece gravity toilets. Often no: pressure-assist, some one-piece, RV, some compact Toto/Kohler layouts. If it doesn’t clip, 30-day refund covers no-fit. Don’t force tank parts.

Scrub what’s already there once. Then every flush fights it coming back. Prevention, not magic erase.

Flush Frog holds up to five standard 3-inch bromine (BCDMH) tablets. Load one tablet you buy separately; replace it when it's gone. Each tablet can last up to one year depending on flush frequency and water conditions, providing up to approximately five years between full reloads. We do not sell tablets. Which cleaning tablets work with Flush Frog?

About three minutes. No tools. Load, clip on the overflow pipe, move the refill tube from the fill valve into Flush Frog, lid on and flush.

30 days, including no-fit. If bowl maintenance isn’t easier, you get the purchase price back. Return shipping is not free.

Free US shipping on the 4 Pack. 1 Pack: shipping calculated at checkout. US only. Orders leave in 1–2 business days.

Full FAQ

Why I invented Flush Frog

I invented Flush Frog after looking at how ordinary drop-in toilet cleaners work and realizing the cleaner was sitting in the wrong place. The ring you’re trying to prevent is in the bowl, but a tank tablet spends all day dissolved around the flapper and seals.

Solve the problem first

What is your toilet doing?

Choose the symptom that sounds familiar. Each guide explains what it may mean, what to check safely and when to call a plumber.

Toilet troubleshooting guide

Toilet Tank Not Filling After a Flush? 8 Causes and How to Fix It

If your toilet tank stays empty or barely refills after a flush, start with the water supply, shutoff valve, float, fill valve, supply line, and flapper. This step-by-step...

Read the guide