For water pretreatmen©₹σΩt equipment. Such as:Solar water₩δ>♠ heaters, electric (✔♥₽;gas) water heat→¥♦↕ers, electric hot water heat ₩α'er;Also applies to the pr✔★÷Ωe-pre-extraction of gr'£®↑oundwater in rural areas; Filter:40-6 ¥"0 microns thick 304 stainless<∏ steel
