Often we talk about RO water purifiers as if like RO is the only way to purify water. But that is not true always. Think about a situation in villages where electricity is a privilege. Can’t they deserve pure water?
Yes, they do. The solution is to use Gravity Water Filters. There is no electricity required, neither any advanced technologies. Yes, Gravity water filters are the simplest form of water filters that we can use to get clean water.
Though we don’t use these filters much now a days due to the high level of contamination in the water but in villages where we mostly get better water still uses gravity water filters.
Gravity Water Filters are also called Non Electric Water Filters as these can be run without any electricity.
So, let’s learn more about Gravity Water Filters here in this article and learn how does they work and are these filters really beneficial for you or not.
Table of Contents
What Is Gravity Water Filter?
We call these machines as filters and not purifier. The reason is that Gravity Water Filters can only filter the water but can not purify the water completely.
If the water TDS level is less than 500, then only Gravity Water Filters should be used. If not, you need to use RO water purifiers.
A TDS level of less than 500 is suitable for human consumption but its not the best. A gravity water filter can filter out harmful particles and other elements that are more than 1 microns of size.
Anything less than 1 micron of size can still pass through the filter. So Gravity water filters does not essentially gives you the purest form of water. But at least it gives better water than normal tap water.
How Does Gravity Water Filters Work?
Most Gravity water filters uses two different types of filters. One is activated carbon filter and the other one is UF filter. Both serves a different purpose in purifying the water.
Activated carbon filters are effective in removing chemical and bad odor whereas UF filters uses hollow fiber threaded membranes to remove bacteria, cyst, and other microorganism which causes water borne diseases.
Ceramic filters are also very popular as these filters are very cheap to own. Similar to activated carbon filters, ceramic filters also uses tiny pores on a ceramic surface to filter bacteria and sediment out of drinking water. It is an affordable and versatile water filtration method that can be installed in households or used as a portable filtration device.
Ideally there are two chambers in gravity water filter. The top chamber is where you will pour water and the bottom chamber collects the clean water after it gets filtered between the two chamber.
The water flows down to the bottom chamber due to gravitational force and that is why these are called Gravity water filters.
Types Of Gravity Water Filter?
Gravity water filters are categorised based on how you install the water filter. Here are the two types of gravity water filter commonly used.
- Ceramic Water Filter
- Counter Top Water Filter
Ceramic Water Filter
Ceramic water filters uses ceramic candles as the purification medium. These water filters are heavy and usually placed on the ground. These water filters are very cheap to own.
Counter Top Water Filter
Counter Top water filter comes with most of the advanced features and can be place on the kitchen counter. Made of plastic and relatively costly than ceramic water filters.
Things To Consider While Choosing A Gravity Water Filter
Gravity water filter is not the best solution when the tap water is very dirty, means the TDS level is more than 500. But apart from that, you need to consider few other aspect before you choose a gravity water purifier.
Types Of Contamination
Gravity water filters can not remove any impurities that has less than 1 microns of size. Sometimes these filters can remove essential metals and minerals which are must for our body. You don’t have any TDS controller or Mineraliser in gravity water filters like how you get it RO water purifiers.
Gravity water filters do not use any tap or pump to force water through the filter. It all works on the gravitational force. Therefore, these gravity-fed water filters have a velocity slower than other water filter types.
When filtering water with a gravity water filter, the system takes more time. Depending on the number of filters present in the filtration system, the water filter needs about 7 hours to filter between 4 and 7 gallons of water.
Advantages Of Gravity Water Filters
The first advantage of gravity water filter is that it does not require electricity. So you can use it anytime and anywhere you want.
You can also place it anywhere you want. No special installation of water line connection is required. All you need to do is to pour water.
These water filters works best when the TDS level is low. Instead of wasting money on RO water purifier, these water filters are a more value for money option as the TDS level is already under the safe limit.
Gravity water filters come in various sizes. They do not need constant water supply. These are very cheap to own and maintain. You may need to change the filter once in a year compare to RO water purifiers where you need to change the cartridge every six month.
Disadvantages Of Gravity Water Filters
The main issue with Gravity Water Filters is the filtration capacity. They are still called filters as these filters can not eliminate all the impurities from the water.
If the incoming water TDS level is more than 500, these water filters are of no use. These filters may remove few impurities but still that water won’t be safe for consumption.
One more issue with gravity water filter is the time to filter water. Since these water filters completely depends on gravitational force to clean water, the filtration process takes too much time.
Conclusion: Do We Need Gravity Water Filters?
Yes, of course. If the TDS level is less than 500, there is no point is wasting money on RO water purifiers. Instead use a gravity water filter that will give clean water and also save on your power bills.
If you don’t have any problem with the slow filtration rate and not getting 100% purified water, Gravity water filters are the best bet.