High cistern refilling issue?

I'm not quite sure if I understand you correctly but when you said sloshing/chugging do you mean the general noise it makes when it is refilling after a flush? Yes this would make sloshing noises it's effectively cascading water into water.

It's not uncommon to hear some water sloshing or chugging sounds in a toilet cistern after flushing, especially in high-rise toilets. This can be due to the design of the toilet and the water filling process. Usually, it's nothing to worry about and is considered normal operation. However, if you notice any continuous or unusual noises, or if the water level in the cistern seems to be constantly changing, it might be worth having a plumber check it to ensure everything is functioning properly.

If is a small noise is normal in my opinion.

Depending on the pupe works Probably the water just going around there just keep an eye for any lleakage

If you are experiencing an issue with a high cistern not refilling properly, it may be due to several factors. Here are some common causes and troubleshooting steps to address the problem:

Water Supply: Ensure that the water supply valve leading to the cistern is fully open. Sometimes, if the valve is partially closed, it can restrict water flow and lead to slow or incomplete refilling.
Float Valve: The float valve is responsible for regulating the water level in the cistern. If it's damaged, misaligned, or obstructed, it can prevent the cistern from refilling properly. Check the float valve for any issues and clean or replace it as needed.
Water Pressure: In areas with low water pressure, it may take longer for the cistern to refill. Check the water pressure in your area and consider installing a pressure-boosting system if necessary.
Obstructions: Inspect the inside of the cistern for any obstructions that may be blocking the fill valve or the water outlet. Remove any debris that you find.
Damaged Components: Examine all components within the cistern, including the ball float, fill valve, and flush mechanism. If any of these components are damaged or worn, they may need to be replaced.
Chain or Lever: If your high cistern uses a chain or lever mechanism to operate the flush, ensure that they are properly connected and functioning. A broken or disconnected chain or lever can hinder the flush and refilling process.
Cistern Water Level: Adjust the water level in the cistern to the manufacturer's recommended level. Most cisterns have a water level adjustment screw or float arm that can be set to the appropriate height.

Attach a hose to the tank fill valve to the base of the tank to reduce the distance from the valve to the base.

People also ask
Why do I hear water running in my toilet?
Ideally, the water level in the toilet tank should be 1 to 1.5 inches below the top of the overflow tube (also called an overflow pipe), an open-ended tube centrally located in the tank. When the water level is too high, water will constantly drain from the fill tube into the overflow tube, causing a running sound.