Turbid water in a new well - do you need a bottom filter?
Good afternoon! On September 2 this year, we dug a new well with an excavator. They dug with me - all the rings were scraped off, and between the rings the seams were well waterproofed (on the outside with a film and between the rings - cement). 8 rings came out, one of them above the ground and from below four in the water (checked with a rope - 4 rings of water).
When they dug, they shot through a quicksand, so they told me to start pumping water only at the end of September - 0.5 rings at a time. I did this already 5 times, but the water does not get any cleaner, the same turbid water - either fine fractions of sand or lime (whitish-brown color of turbidity). More precisely, after the first pumping (when I started the second one) it went cleaner at first, and when I pumped out 0.25 rings, it went dirty again!
At the same time, water is replenished after pumping out very quickly, for about 30-40 minutes, 0.5 rings are replenished. After each pumping out 0.5 rings I check the depth with a rope - no change, 3.5 rings of water remain.
Please tell me what to do? Maybe the bottom filter will help me? From what and which is better to order (if it helps)?
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Good afternoon, Alexander! The reasons for the appearance of turbidity in the well, in principle, are only two: the turbidity rises from the bottom or seeps through the seams in the rings. You write that you have sealed the joints reliably, but even this is not a guarantee of tightness.
The fact is that after mounting the rings in the soil around the well, significant displacements are possible, as a result of which strong pressure is exerted on the reinforced concrete rings, and they are shifted and, accordingly, the joints are depressurized. The first thing to do is to inspect the well to the full depth. If joint defects are found, unfortunately, you need to dig out a well, seal the seams inside and out, and then fill it up again, moreover, with soil compaction.
If the inspection did not reveal defective seams, then the turbidity comes from the bottom. Here you can take the following measures:
1) To build a bottom filter, which is backfill with a layer of 15-20 cm from marble chips (bottom layer), shungite (middle layer) and fine gravel or pebbles (top layer). The thickness of each layer is 5-7 cm, the fraction of granules is 15-20 mm.
2) Replace the submersible pump with a surface pump with a floating nozzle. In this case, the pump will not stir up the water, and will take it from the clean top layers.
If these measures are not enough, then you can try to deepen the well by breaking through the limestone layer, which gives dregs. But there is no guarantee that the underlying layers will be aquifers and the water in them will be of the required quality.
The second option is to install a ground-based filter system, for example in a house. Before buying filters, you should do a water analysis, which is used to select equipment for water treatment by type and capacity. Read more about the causes of turbidity in water and possible solutions to the problem, see this article.