Ordering a cistern (concrete) online - experiences?

We direct all the water from the roofs, terraces, etc. into the cistern. We also have a well that is pumped. The garden needs a lot of water. Fortunately, we have sufficient rainfall here, but when it is dry, watering with fresh water has sometimes been prohibited. Such a cistern helps with that. Lawns require about 15l/m2/week. With almost 1000m2, that is already 60m3 per month. In addition, there are hedges, trees, flowerbeds... with the well and the cistern we can bridge about 6 weeks of drought. Due to the size, we can also utilize heavy rain. Whether it pays off. Eventually, yes. But that was not the reason for the installation in our case. We could not supply the irrigation from the fresh water line due to the flow rates.

This is what the part looked like upon delivery:

We direct all the water from the roofs, terraces, etc. into the cistern. We also have a well that is pumped into it. The garden needs a lot of water. Fortunately, we have sufficient rainfall here, but when it’s dry, watering with fresh water has sometimes been prohibited. A cistern like this helps. Lawns require about 15l/m2/week. With almost 1000m2, that’s already 60m3 per month. Added to that are hedges, trees, flowerbeds… with the well and cistern we can bridge about 6 weeks of drought. Due to its size, we can also make use of heavy rain. Is it cost-effective? Eventually, yes. But that was not the reason for installing it for us. We couldn’t supply irrigation from the fresh water line anyway due to the flow rates.

Why do you pump the well water into the cistern first instead of irrigating directly with it?

Not sufficient pouring, filtering, distribution, and buffering. Also, it would be redundant since the rainwater must also be collected. We operate in irrigation (so at the end of the circles and not on paper) with 18,000L/h.