If you're staring at that will big, rounded tank sitting next in order to your pump plus wondering what is a pool sand filter , you are able to basically think of it as the large kidney of your going swimming pool. It's a pretty straightforward piece of equipment that will handles the dirty work of maintaining your water obvious so you aren't swimming in a soup of hair, skin cells, and whatever else the wind blows within. While it looks like a simple plastic or fiberglass carol, there's a lot of physics occurring inside that maintains your backyard oasis from turning into a swamp.
Most pool proprietors gravitate toward sand filters because they're the "set this and forget it" option of the pool world. They aren't as finicky since DE filters and they don't need the constant scrubbing up that cartridge filter systems often do. When you're looking regarding the way of minimum resistance to a clean pool, this is usually where you'll finish up.
Exactly how the Magic Occurs Inside the Container
To really get what's going on, you have to imagine the water's trip. Your pool push pushes water into the top associated with the filter tank. Inside that container is a dense bed of specialized sand. Because the drinking water trickles down through the sand, the jagged edges of the sand grains act like tiny claws. They grab onto dirt, debris, and microscopic algae, trapping all of them within the spaces in between the grains.
By the time water reaches the bottom of the tank, it's stripped of most of its junk. At the particular very bottom, generally there are these perforated pipes called laterals. These are created with tiny slits that are little enough to let the clean water through but too small for the sand to flee. The clear water then mind back through your own return lines plus into the pool. It's a simple, effective cycle that repeats all day time long.
What's cool is that as the sand gets a tiny bit unclean, it actually begins to work better . The trapped debris helps fill within the gaps between the sand grains, allowing the filter to catch also smaller particles. Associated with course, there's a limit to this—eventually, it gets so clogged that the water can't obtain through easily, which is when you have to step in.
The Type associated with Sand Matters
You can't just head down to the particular local hardware shop and grab a bag of have fun with sand for your own sandbox. If a person tried that, you'd end up with a cloudy mess and a wrecked pump. The "sand" in a pool sand filter is specifically graded #20 silica sand. Every grain is roughly 0. 45 to 0. 55 millimeters in size. This specific size is important because it's little enough to filter out debris but large enough not really to wash back in your pool.
Some people are getting off traditional silica and taking advantage of recycled glass media rather. This might sound a little bit weird to put glass within your filter, but it's really crushed so good that it feels like sugar and isn't sharp at most. Glass media is a bit more expensive upfront, however it doesn't "gum up" as quick as silica and can actually filter away smaller particles. There's also zeolite, which is a mineral that has a massive surface region and can actually help manage chloramines in the water. Yet for most people, standard silica sand is the reliable that gets the job done.
Understanding the "Backwash" Procedure
Since the particular filter is constantly trapping gunk, this eventually gets full. You'll know this is happening mainly because the pressure gauge on top of the tank will start to rise. When that filling device gets about 8-10 psi higher compared to its "clean" reading through, it's time in order to backwash.
Backwashing is simply a fancy way of saying you're reversing the stream of water. You turn a lever on the multiport valve, and rather of water heading top-to-bottom, it blasts from the bottom-up. This lifts the particular sand bed, fluffs it up, and carries all the trapped dirt out through a waste hose. You'll generally see a little glass window (a sight glass) upon the side associated with the valve; as soon as that water appears clear, the filter is clean. It usually takes about two or 3 minutes, and it's oddly satisfying in order to watch all that will brown water disappear to waste.
Don't Miss to Rinse
After backwashing, a person always want to run a "rinse" cycle for about 30 seconds. If you skip this, you'll probably see a big puff of filthy water shoot back into your pool the moment you turn the filter returning to the "filter" setting. Rinsing forms the sand back into its mattress and flushes away any remaining lurking dirt.
Why People Love Sand Filters
In the event that you ask a long-time pool proprietor what is a pool sand filter 's biggest benefit, they'll probably say "durability. " These types of things are constructed like tanks. In contrast to cartridge filters, exactly where the pleated fabric can tear or get oily, sand is basically indestructible. You aren't going to "break" the particular sand.
Another huge plus is the cost. Sand filters are usually generally probably the most affordable option when you're looking at the initial purchase price. And the ongoing maintenance costs are incredibly low. A handbag of filter sand isn't likely to split the bank, and you only have to replace it every five to seven yrs. Compare that to cartridge filters that will might need fresh (and expensive) elements every couple associated with seasons, and the savings begin to add up.
The particular Downsides to Think about
It's not really all sunshine and rainbows, though. Presently there are a number of trade-offs. The main a single is filtration degree. Sand filters are usually great, but they filter down to in relation to 20 to 40 microns. To give you some circumstance, a human tresses is about fifty microns wide. While 20 microns is pretty small, it's not as great as a SOBRE filter, which may catch things simply because small as 2 to 5 microns. Most people can't tell the difference with the nude eye, but if you have a massive algae bloom, a sand filter may take a small longer to clear it up.
The other thing is water waste. Each time you backwash, you're pumping many dozen (or also hundreds) of gallons of treated pool water out of your system. In case you live in a location with tight water restrictions or when you have an extremely expensive salt system, this can end up being a bit associated with a bummer because you'll have to best off the pool and re-balance your own chemicals afterward.
When Should A person Replace the Sand?
One of the most common questions after "what is it? " is "how longer would it last? " As mentioned, sand generally lasts about 5 to 7 yrs. Over time, the constant rush of drinking water wears throughout the sharpened edges from the sand grains, making them circular and smooth—sort of like river rocks. Once they're smooth, they can't "grab" the dirt simply because well, and you'll notice your drinking water just doesn't stay as crisp because it used to.
Another sign it's time for a change is when the sand begins to "channel. " This happens when minerals or oils cause the sand to clump jointly, creating literal passageways where water can bypass the sand entirely. If you're backwashing regularly yet the pressure stays high or maybe the water stays cloudy, it's probably time for you to get out the aged sand and put in some clean stuff.
Maintaining Things Running Easily
If you want to get the most out of your own sand filter, generally there are a few professional tips to bear in mind. First, try to keep oils out there of the pool. Suntan lotions and body oils are the enemies of sand. They create a sticky film that may turn your sand into a strong block of "sandstone. " Using an enzyme treatment as soon as a week may help break all those oils down before they reach the filter.
Furthermore, be gentle with the multiport device. Often turn the pump off before you shift the handle. In case you try to switch settings as the water pump is running, you'll likely blowout the internal gasket (called a spider gasket), and then you'll have water leaking out of your waste range when it's supposed to be blocking.
At the end of the particular day, a pool sand filter is the blue-collar worker of the pool world. It isn't flashy, and this doesn't have the particular highest "specs, " but it shows up every day and gets the job completed with minimal complaining. If you would like a clear pool without having to become a part-time pool technician, a sand filter is almost often the right method to go.