Waterscience CLEO Shower Filter For Hard Water https://amzn.to/3OOs8Fa - 1995/- on 11-12-2024 WaterScience CLEO Shower and Tap Filter for Hard Water https://amzn.to/3DjmlEW 1345/- on 11-12-2024 Both are in catridge size of 3 inch by 4inch... Vollume = 0.46 liters Catridge catridge cost = 802/- https://amzn.to/3ORD9Wq WaterScience RIO Single Stage 20-Inch Mainline Hard Water Filter for Tank https://amzn.to/3ORtU8o - 9000/- on 11-12-2024 Size - 180mm by 508 mm vollume = 13 Ltr /- Sodium Hexametaphosphate (SHMP) - Geolite 1995/- 2495/- 5 inch 2990/- 3990/- balls price https://www.amazon.in/PARIJATA-antiscalant-siliphos-polyphosphate-softener/dp/B0BX72LFCZ https://www.amazon.in/dp/B09C8RJ5LP food grade are costlierthan industrialgrade difference in vollume forboth = 13/0.46 = 28 times .. cost of small to eqate this = 802 X 28 = 22456/- 13000 extra to 9000/- 9000 -1350/- ...