Deposito Delta is a water tank and filtration firm based in Manises, in Valencia province. Its Google Business Profile lists it as “Water utility company”.
It has no Google reviews yet, so ask for references from recent customers and, if you can, a finished job you can see.
Other water tank and filtration firms within 20 km include Depósitos de Agua Monteyor in L' Eliana (2 km), Depósitos de agua in Godella (5 km), Depósitos de agua de Godella in Burjassot (8 km). Getting two or three quotes is normal for this kind of work.