In water purifiers, the iron removal filter needs to be cleaned every 3 months by striking it continuously with something hard along with the backflow of water. But this technique is really tiresome and takes much effort and time. Is there any easier and faster way to do this?
The filter you show for the unit you have cannot be cleaned for reuse.
It is replaceable and should not be reused due to the chemical action of the filters construction. It cannot be reversed mechanically for reuse. The filter is not simply a mesh kind of screen that can be flushed clean. Attempting to do as you wish will compromise the filter effectiveness possibly making your whole filtration unit unusable. The spent filter is a consumable and must be discarded according to the manufacturer's recommendations and replaced with a fresh filter.
Using chemicals that are not approved for the filter can have unexpected consequences. The filter can be destroyed. The unit that holds the filter can become unusable. Lastly, you could hurt yourself by ingesting toxic chemical residue.
I shall try to respond to the only familiar words in the question: tiresome, effort, time, and my favourite word easier. I think that the word efficient may not apply.
Disclaimer: I cannot say much about the backflow of water. If you have to reverse the filter between two pipe fittings, and put it back into the water line, I don't understand. …
If you are talking about pouring some water into the back end with a funnel, say, that's different.
It's an iron filter. Perhaps a strong rare-earth magnet dropped into the open end of the water filter, withdrawn using a string, remove iron particles from the thing, and repeat.
It's a pain to sit there under the sink with a heavy spoon whacking the filter. Perhaps a strong electric vibrator can be fastened to the side of the filter to do the whacking for you.
An old-fashion heavy-duty fire alarm bell has an electro-magnetic clapper that can out-tap you 1000 times better. Get one at a salvage store, remove the noisy bell and let the little ball bang away.
If you have a hammer-drill, you can make a collar from a steel adjustable ring, make and attach a collet to go into the drill chuck and let the drill hammer away at the filter.
Try the dishwasher! If it is small enough, I would suggest the silverware section. Pros: Super easy and fast. Cons: can't iron for a while (shucks) and possibly faster deterioration of the plastic.
Note: I have never tried this before. If the filter feels flimsy (ie: the plastic or mesh) enough that it may be wrecked by putting it in the dishwasher, DON'T try this.
If the filter is trapping iron oxide (rust) particles, then the following describes a chemical means of clearing the filter.
Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust (iron complexing agent). Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water-soluble salt with ferric iron, ferrioxalate ion.