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How To Increase GPF On Toilets? [5 Easy Methods]

It becomes incredibly frustrating when your toilet doesn’t have enough GPF. These low-flow toilets are supposed to save money and help the environment. But they lack flushing power. In the end, double flush defeats the purpose.

How to increase GPF on toilets?

You can’t actually convert your low-flow toilet into a high-flow toilet. But you can definitely increase its GPF. For example, raising tank float or cylinder float creates more powerful flushes. Unclogging the toilet can also increase the water flow. Repairing or replacing the flush valve is another great way to make flushes stronger.

This much info isn’t enough. That’s why we’ve explained the methods below. Here, these 5 methods will help your toilet flush more water on each use. Stay tuned to learn this repairing process- 

5 Methods To Increase GPF on Toilet

Your toilet having low GPF is one of the most annoying situations. Modern low-flow toilets flush around 1.2-1.6 gallons peruse. You might find a stamp on the lower side of the toilet. It will indicate the amount of water your toilet uses per flush. 

If it shows 1.6 gallons peruse that signifies low flow. Besides, you can recognize the toilet is low flow if you bought it in recent years. 

Maintaining regular bathroom cleaning is the main key. This way you can increase GPF on toilet flush power. If you want a high-flow toilet, regularly wash your toilet. Anyway, there are some methods that’ll help you to resolve low GPF immediately- 

Method 1: Elevate The Tank Float

You can start this operation by checking out the tank float. Carefully raise the tank float and peek inside the tank.

Look inside to see how much water there is. If the float level is too low, this is the reason for the low flow. 

To fix this, look at the float inside the tank and try to find a screw. The screw will be in between the float and the valve. 

Grab a screwdriver and turn that screw slowly. The float will rise as you turn the screw and the water level will elevate as well. 

You can just stop when you are happy with the water level. This added water level will allow the tank to flush more water each time you use the toilet.

Method 2: Adjust Cylinder Float

You can even improve your toilet’s overall performance by adjusting the cylinder float. It’s in a cylindrical shape and will be found at the center of the tank. 

You need to locate a thin adjustment stem after that. It’s connected with the cylinder float and runs into the fill valve. 

Grab the release clip attached to the adjustment stem and slightly pinch it. You might need to use a screwdriver if it doesn’t rise through your hand. 

Turn the screw clockwise to raise the cylinder float. Turn it until it reaches its proper height. The trick to using the screwdriver is easy. It’s similar to replacing grohe thermostatic shower valve if it has issues.

Method 3: Clean Out Toilet Flush Holes

Flush holes proceed the toilet to fill with water each time you flush. The flush hole can be clogged and gradually weakens. The only way to settle flush holes is to clean them thoroughly. 

Use something similar to a bobby pin to remove the obstruction. Wear gloves and poke the pin inside holes to clear them out. Plus try to wash the toilet with acidic toilet bowl cleaner.

There are several brands of acidic toilet bowl cleaners available. This list of ours might help you to choose one-

Product 1 
Product 2

Try to clean the holes on a regular basis and treat them with chemicals. Chemicals clean the holes from the depth and protect flush power. Regular cleaning will keep your toilet more powerful after unclogging flush holes.

Method 4: Unclog The Toilet

Clogging might be one reason that toilets won’t fill with water. Clogging issues are super common in our household. Even your bathroom sink can have low water pressure due to clogging. 

That’s why you can definitely assume your toilet might have a mild clog deep in the toilet drain. Because this affects the flushing power or GPF rate. To get rid of this problem, you need to unclog the drain quickly.

You can use different tools to unclog the toilet. For example, use a plunger, drain snake, enzyme chemicals, or Drano. 

Drain snakes and plungers work the best to remove clogs in the toilet. Plunge the toilet around 10-12 times to knock any blockage loose. You can also apply enzyme cleaners in the drain to dissolve blockages. 

Plus clogs take a longer period of time to form. That’s why it’s better to treat the toilet preemptively.

Method 5: Repair flush Valve

The flush valve creates a seal with tight suction. It helps the toilet to flush each time. Yet, sometimes this seal becomes loose. 

As a result, it causes weak flushes or no flush at all. To fix the issue, remove the toilet tank. Locate the flush valve near the cylinder now and the tank floats.

Inspect the valve and find if it’s loose or not afterward. You’ll have to repair the valve if it’s too loose to flush properly. For repairing this gear simply push the ring around it down. It will be tightened and form a proper seal.

See? It’s not that tough to increase the GPF of your toilet. Plus it definitely took less time than the time for retiling a bathroom

These are all the solutions to increase GPF on your toilet. If you follow us thoroughly, you can solve this matter easily.


Question: How do I know if my toilet is low flow?

Answer: You can identify if your toilet is low flow by checking the stamp on the toilet. Check stamp on the lower side of the seat. When it shows 1.6 GPF, that means it’s a low-flow one.

Question: Which is better 1.28 or 1.6 GPF?

Answer: The answer is, none. A 1.28 GPF toilet flush of 1.28-gallon water on each flush. Whereas, a 1.6 GPF toilet uses 1.6-gallon of water on every flush. 1.28 GPF toilets are more water-efficient than the 1.6 GPF one. But none of these are necessarily finer than the other.

Question: How do you flush out less water?

Answer: You can save money by flashing out less water. To flush less water, set a plastic bottle in the tank behind the toilet. Pour water and pebbles into that bottle and put it inside the tank. This weighty bottle helps your tank fill up less water. This is how it limits the amount of every flush.

Bottom Line

We’ve reached the end of our discussion about how to increase GPF on the toilet. We hope now you have all the necessary information you wanted.

Until next time, stay well!