Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "When a man dies, his deeds come to an end except for three things: Sadaqah Jariyah (ceaseless charity); a knowledge which is beneficial, or a virtuous descendant who prays for him (for the deceased)."
Providing a water pump is a form of Sadaqah Jariyah for yourself or a loved one you have lost. Imagine this being provided as a gift, on a golden tray, to a loved one while they're in their grave.
For £150 you can provide a water pump to the poorest areas in Pakistan and Bangladesh. The prices for pumps on other countries vary.
Jazak'Allah for your time and your kind donations.