Inground Vs Aboveground Pool Filters – What is the Distinction?

Is there an enormous distinction between filters for aboveground swimming pools and inground swimming pools? They each filter water proper? In addition to, the producer’s specs inform me that this filter can filter a swimming pool as much as 20,000 gallons.  So why ought to I’ve to pay greater than double the worth?  The brief reply is sure, however let’s not be penny smart and pound silly. 

These are typical, cheap questions that many pool house owners ask.  Let’s take a look at among the main variations between filters for aboveground swimming pools and inground swimming pools.  However first we’ll take a look at the similarities.

The similarities between inground and aboveground pool filters are fairly easy.  The primary similarity is that there are 3 kinds of pool filters – Sand, Diatomaceous Earth (DE), and Cartridge.  The second similarity is that they work basically the identical – a pump attracts water from the pool via the skimmer, then the water is pumped via the filter tank and its media (sand, DE or cartridge) and returns to the swimming pool clear and filtered.

The variations cope with pool plumbing or piping, mandatory circulation and eventually measurement.  Let’s talk about them so as.

Pool Plumbing. The most important distinction could appear to be pool measurement and gallonage.  However in actuality, it is extra of a perform of pool plumbing. Most aboveground swimming pools have their filter system proper subsequent to the swimming pool.  Plus, the filter and pump & motor are usually situated under the water degree. In different phrases, the filter system is normally on the bottom with the hose from the skimmer feeding immediately down into the pump and the filtered water returning as much as the pool’s return jet – gravity feed.  Most aboveground swimming pools have not more than 6 to 9 ft (about 2 to three meters) of hose on both sides – a complete of 12 to 18 ft.

Inground swimming pools alternatively can and do have many extra ft of piping and plumbing.  On high of that, there are normally a number of skimmers or different suction strains – generally working in tandem, generally not.  Then there are a number of return fittings or “eyeballs” or jets.  This is an instance, my swimming pool (with solely about 16,000 gallons) has a skimmer, decrease suction, and a couple of return fittings.  Every wall becoming has its personal pluming line.  Regardless that the filter sits simply 15 ft from the pool, let’s take a look at what number of ft of pipe there are for every line.  The skimmer and decrease suction are comparatively shut to one another, in order that they every use about the identical quantity of piping – roughly 40 ft every line or a complete of 80 ft going into the pump.  The return fittings are on reverse sides of the pool.  One return line is about 30 ft from the filter, the opposite is about 50 ft – one other 80 ft.  My pump & motor has to tug and push water a complete of greater than 160 ft or TEN occasions the space of a mean aboveground pool.  Plus we have not talked about heater, valves, elbows and different fittings utilized in inground swimming pools.

Needed Circulate.  Understanding circulation is the “nice thriller” of the pool trade.  Only a few individuals apply it effectively.  Merely acknowledged, FLOW is placing the right amount of water via the system to adequately filter the water.  It is not all about Horsepower. Actually, most pool techniques function with an excessive amount of horsepower!  And that is a waste of vitality and cash.  Consider it this fashion: all pipes or hoses (relying on their measurement or diameter) can solely deal with a specific amount of water circulation – as an example it is 100 gallons per minute (gpm) for instance.  You or pool man determine {that a} new pump is required.  “Let’s use one thing somewhat greater that offers you ‘higher’ suction,” he says.  Now a pump is put in that pumps 125 gpm – nice!  Not so quick! Your pipes can solely deal with 100 gpm.  Do you have got higher suction? Perhaps.  Are you utilizing extra vitality to run the bigger pump? Positively.  Roughly 25% extra vitality.  Not solely that, however the filter would not appear to filter in addition to earlier than.  That is as a result of the water is being pushed too shortly via the media (very true of sand filters) – the filter system has to run longer as a result of the dust cannot be as simply trapped.

However that is only one a part of the circulation dialogue.  The opposite half is one thing referred to as “head.”  Head is how excessive the pump has to tug or push water up.  Most inground swimming pools have their filters above the water degree.  Generally inside a foot or two (lower than 1 meter).  Generally, it may be 10 to fifteen ft.  The pump has to attract all of that pool water 15 ft as much as the filter.  Consider this fashion: is it simpler to carry a glass of water over your head and pour it into your mouth or to make use of a straw to sip (suction) it?  Plus then there are photo voltaic heating panels (usually put in on the roof of the home or pool shed) and fountains or different water options.

Measurement. Lastly we come to measurement.  Pool measurement. Filter measurement.  It is all vital.  Can an aboveground filter system filter 20,000 gallons of pool water? Sure. However is an aboveground filter system in a position to correctly push water via 100 plus ft of piping and create sufficient circulation within the pool to push water down 6 or 8 ft in depth and again up once more?  Or how about doing all of that plus getting the water 25 to 30 ft in numerous instructions?  Inground pumps are made to do all of that pushing and pulling of water.  Aboveground pumps cannot.

How about filter measurement? Inground swimming pools sometimes have 20,000 to 40,000 gallons of water.  All of that water must be filtered 2 to three occasions each day for finest efficiency (see our ezine article on Correct Circulation: “Circulation – First Key to Good Pool Care” for extra data).  A bigger filter is required for the bigger quantity of water.

As a mandatory apart, bigger aboveground swimming pools ( 27 ft spherical and bigger, and 18 x 33 oval and bigger ) ought to take into account using a correctly sized inground filter system.  After the primary season, many massive aboveground swimming pools expertise water high quality issues attributable to insufficient filter techniques.  Sadly, these swimming pools are “hampered” by the issue of getting just one skimmer and one return cut-out.  Ask your native pool skilled to configure your system accurately.  Will it price extra initially? Sure, however you’ll be far more happy in years to come back.


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