Plastic caisson for the well: how to choose and install

One of the most pressing problems for owners of country houses is the arrangement of water supply and sewage systems. And this is natural, because in the absence of a centralized water supply, everyone has to solve this problem on his own. Consider one of the most popular methods for this: a plastic caisson for a well. We will try to figure out what its advantages over others, and whether it is possible to carry out the installation yourself.

Plastic caisson for the well: how to choose and install

Plastic caisson for a well: what it is and why it is needed

Proper well construction is the main condition for its stable operation throughout the entire calendar year. That is why we must not forget that in our climatic zone in winter, the temperature drops well below 0 ° C, which leads to freezing of water. Therefore, installing plumbing equipment, you must consider how to protect it from freezing.

Plastic caisson for the well: how to choose and install

At great depths, where the aquifer lenses are located, there is no frost, but closer to the surface of the earth, where the pumping equipment is located, serious temperature drops can lead to its malfunction. Freezing the water inside the pipes can cause them to burst, and the entire aquifer system will require repair. In order to avoid this and apply caissons.

Caisson is a special heat capacity with a lid, which is necessary for almost every well. The only exception is the case when it comes to a heated building. Although this option is quite rare, since, despite all the comforts associated with the maintenance of the system, it is very noisy inside the building. Therefore, most owners of country houses prefer the arrangement of the well with the use of plastic caisson.

Plastic caisson for the well: how to choose and install

The composition of the plastic caisson includes the following components:

  • water supply pump;
  • filtration equipment;
  • fittings designed to shut off the flow;
  • expansion tank;
  • several instruments measuring pressure inside the system;
  • automation.

The caisson is installed on the casing at a depth of 1-2 m, which allows you to protect the system from even the most severe frosts.

Helpful advice! Additional installation and output of the nozzle allows you to connect a hose for watering the garden.

Plastic caisson for the well: how to choose and install

More recently, it was believed that plastic equipment is too fragile and not very suitable for use in such harsh environments. But modern technology has allowed to create plastic caissons, which are great for installation in wells. Today, plastic is one of the most popular materials used for this purpose.

The composition of the plastic caissons includes polyethylene, non-plasticized PVC, polypropylene and fiberglass. All these additives provide the capacity for additional durability and reliability. Consider all the advantages and disadvantages of using caissons from this material.

Plastic caisson for the well: how to choose and install

Advantages of using plastic caissons:

  • simpler maintenance and repair work. With a ladder, you can easily check the status and functionality of all the constituent elements;
  • plastic caissons can boast a decent service life – about 50 years;
  • thermal insulation performance of plastic is high enough, thus avoiding additional insulation of equipment in regions with temperate climates. But even if additional warming is necessary, it is quite simple to do this – you can simply equip a warming shelf;
  • Plastic – one of the most inexpensive materials for today. That is why the use of plastic equipment will cost you much cheaper than products made from any other material;
  • Plastic retains all its properties throughout the entire period of operation, while it does not undergo processes of decay and corrosion;
  • in the process of installing plastic caisson you do not have to worry about waterproofing;

Plastic caisson for the well: how to choose and install

  • plastic has a low weight, which allows the installation of equipment without the participation of special equipment and without attracting specialists;
  • Modern plastic caissons do not have seams and joints, which makes them more durable and significantly reduces the risk of damage during use.

Among the disadvantages of this type of equipment, only one significant drawback can be identified – plastic is subject to deformation. However, this can only happen if the groundwater is too close to the ground. If you had to deal with such a situation – you can solve the problem by pouring a 10-centimeter layer of concrete around the tank.

Note! Some modern constructions have been developed taking into account the probability of groundwater flowing close to the ground and have a special field for pouring concrete.

Plastic caisson for the well: how to choose and install

In addition to plastic caissons, you can find products made from metal or reinforced concrete. What advantages they have and how to make the right choice, equipping their own water well with a caisson, we will consider further.

Concrete caissons today are extremely rare. This is due to the fact that the disadvantages of their operation far exceed the advantages. They are very expensive and at the same time require the most complicated installation procedure, which is associated with a large construction weight. There is no way to do without the help of specialists, as well as calling special equipment, which also entails additional costs.

In addition, due to its weight, concrete structures exert a serious load on the ground, which often leads to its subsidence, and as a result – the appearance of damage in the water supply system. In addition, such caissons require the arrangement of high-quality waterproofing and a very reliable foundation. Photos of caissons made from this material can be seen on the Internet.

Plastic caisson for the well: how to choose and install

The advantages of metal tanks is the fact that you can make such a caisson for a well with your own hands. How to make and install a metal structure – you can look in the video or photo instructions. It will be easier to buy a metal caisson, but before you do this, you need to weigh all the pros and cons.

This solution has one major drawback: most of the cheap and medium-cost materials are corrosive. Those models that are resistant to virtually any external factors, have a very considerable price. Also, the prices of metal caissons for a well can vary considerably depending on the manufacturer.

Plastic caissons Triton are the most popular in the domestic market. Depending on the size, their cost can vary from 18.5 to 80 thousand rubles. You can familiarize yourself with the current pricing policies of other manufacturers from the table below:

Manufacturer Specifications Sizes, mm Weight, kg price, rub.
Metal Rolling Plant (Russia) Rectangular metal caisson with built-in ladder. The cover is additionally insulated 2000x1000x1000 280 23,000
Round-shaped metal caisson with built-in ladder. Cap lid insulated 250 19230
Termite 2000 (Russia) Plastic caisson. Allows installation of several holes for pipes of various diameters. 1440×2100 85 31500
Alta Group (Russia) Plastic caisson with a base of 8 mm. Equipped with an internal staircase and a shelf for warming. 1000x1000x1630 44 25100


Buy a caisson for a well – only half the battle. After it is delivered to the site, it must be installed. However, not everyone wants to do this on their own. Most prefer to turn to professionals and order the installation of a caisson for a well from a company that specializes in this.

Some companies offer their customers free installation of equipment, provided that you have to buy a plastic caisson from them. However, this can be met infrequently, and the products they offer will have a cost that is several times higher than other similar offers.

Consider the average price range for installation work on the device of the caisson in the well:

  1. Digging a pit for a caisson will cost about 12,000 rubles.
  2. Installation of the device inside the well – 9000 rubles.
  3. Installation of the pump will cost about 8,000 rubles.
  4. Works connected with excavating trenches, as well as laying a cable – 1600 rubles per 1 running meter.

Plastic caisson for the well: how to choose and install

Thus, for the complete arrangement of the system you will have to pay a considerable amount, especially if you consider the additional equipment of the irrigation system and other trifles. It makes you wonder that the price of a plastic caisson for a well should not be too low. Since installing a cheap substandard tank for such money is simply inappropriate.

Despite the quite affordable prices of ready-made caissons, many tend to try to make them yourself, using the available materials. One of these options is a concrete caisson with your own hands. If you decide to give preference to this option, then you need to familiarize yourself with some of the features of this process:

  1. The main difficulty is to provide an exact tight connection of the rings to each other. Therefore, the installation process should be given special attention.
  2. The diameter of the concrete rings can be any, but do not choose too large – they complicate the installation process and often do not justify themselves.
  3. Do not forget about quality waterproofing. For this purpose, use bitumen mastic.
  4. Take care to create a solid foundation: use a concrete solution for formwork.

Plastic caisson for the well: how to choose and install

The caisson device for a well of concrete rings is a rather complicated process, which is almost impossible to carry out without the involvement of special equipment. The structural elements are too heavy to be lowered into the excavation manually. Repair of a caisson made of concrete rings is also difficult, however, in the event of holes between the rings, it is necessary.

Before proceeding to the direct installation of the caisson on the well, it is necessary to prepare a reliable basis for it, trench Its dimensions must necessarily be larger than that of a plastic tank by about 20-30 cm. At the same time, at the bottom of the pit, you need to additionally make a small depression that will help fix the container. You can do this by following simple guidelines:

  • on the leveled bottom of the pit, pour some sand;
  • then an even layer of fine gravel;
  • to ensure the rigidity of the structure, a reinforced frame is installed on top;
  • after that it remains only to pour the concrete and wait until it is completely dry.

Plastic caisson for the well: how to choose and install

In the course of work it is important not to forget that if the system is equipped with a hydroaccumulator, then the hole for the pipe should be located a little to the side. In this case, the ideal option is if the casing will protrude above ground level. Thus, the installation procedure is greatly facilitated.

Particular attention should be paid to the process of attaching the plastic caisson to the pipe. This will require attention and accuracy. Some of the most modern models are equipped with special cavities designed for concrete. If the system provides for the presence of a hydroaccumulator, then all equipment may be tied to a previously prepared base. After the caisson takes its place in the pit, the remaining gaps are covered with dry earth.

As mentioned earlier, if the groundwater level is too high, the remaining gaps also need to be poured with concrete to prevent damage to the tank. In addition, you can use for this reinforcement. This is a more reliable way to protect the well. Before pouring concrete, it is important not to forget that all cables and pipes should be brought outside.

Plastic caisson for the well: how to choose and install

Note! Be sure to wait until the concrete completely hardens, otherwise you will have to start all the work from the very beginning.

If we talk about the choice, then buy a plastic caisson for the well – this is the best solution. This type of product is devoid of the shortcomings of its predecessors and allows you to carry out all the work on your own. That is why caissons for plastic wells are deservedly popular and, in most cases, preferred for purchase. And although the price of a metal caisson may be a little less, all the advantages of using plastic in this case are obvious.

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