<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>Jedd</author><text>It does, but it isn&amp;#x27;t.&lt;p&gt;Similarly multiple out-going pipes to split off various levels of grey waste (some direct to garden, others, to soakways, or to septic processing systems).&lt;p&gt;Capex for these kinds of systems is ultimately dwarfed by savings on opex - just like we find with mandatory double-glazing &amp;amp; other insulation regulations.</text><parent_chain><item><author>stult</author><text>Wouldn&amp;#x27;t salt water in toilets require two sets of pipes leading into each home? Seems like an expensive proposition unless you&amp;#x27;re building a new community from scratch.</text></item><item><author>Kayou</author><text>I thought 130 litres&amp;#x2F;person was quiet high and probably included things like water to grow vegetables, but no, one shower is between 30 et 50 litres and each time you go to the bathroom, it&amp;#x27;s 10 litres of drinkable water.&lt;p&gt;Of course, I you have saltwater and no freshwater, you would probably use saltwater in your toilets, so that could reduce the daily usage of at least 20 litres. But then, if you consider agriculture and manufacturing, I guess that the number of 130litres&amp;#x2F;person would blow up completely.</text></item><item><author>bencollier49</author><text>6 litres &amp;#x2F; metre-squared per hour.&lt;p&gt;We require 130 litres &amp;#x2F; person per day in Europe. A town of 10,000 people would require 1,300,000 litres &amp;#x2F; day = ~54,000 litres &amp;#x2F; hour = 9000 metres-squared.&lt;p&gt;A facility of 100 x 100 x 1 m seems feasible. Based on those calculations, this all seems quite practical. I do wonder how frequently the filters need to be changed, though.</text></item></parent_chain></comment><story><title>Freshwater from salt water using only solar energy</title><url>http://news.rice.edu/2017/06/19/freshwater-from-salt-water-using-only-solar-energy-2/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>Shivetya</author><text>Well at the commercial level we certainly could and it has been done though most of the uses I have seen are to golf courses and certain parks. certainly large commercial buildings could have a separate set of pipes to provide toilets with water.&lt;p&gt;now what should be more easily done is require building codes to insure large complexes have separate gray and black water pipes so that easier to treat water is routed better.</text><parent_chain><item><author>stult</author><text>Wouldn&amp;#x27;t salt water in toilets require two sets of pipes leading into each home? Seems like an expensive proposition unless you&amp;#x27;re building a new community from scratch.</text></item><item><author>Kayou</author><text>I thought 130 litres&amp;#x2F;person was quiet high and probably included things like water to grow vegetables, but no, one shower is between 30 et 50 litres and each time you go to the bathroom, it&amp;#x27;s 10 litres of drinkable water.&lt;p&gt;Of course, I you have saltwater and no freshwater, you would probably use saltwater in your toilets, so that could reduce the daily usage of at least 20 litres. But then, if you consider agriculture and manufacturing, I guess that the number of 130litres&amp;#x2F;person would blow up completely.</text></item><item><author>bencollier49</author><text>6 litres &amp;#x2F; metre-squared per hour.&lt;p&gt;We require 130 litres &amp;#x2F; person per day in Europe. A town of 10,000 people would require 1,300,000 litres &amp;#x2F; day = ~54,000 litres &amp;#x2F; hour = 9000 metres-squared.&lt;p&gt;A facility of 100 x 100 x 1 m seems feasible. Based on those calculations, this all seems quite practical. I do wonder how frequently the filters need to be changed, though.</text></item></parent_chain></comment><story><title>Freshwater from salt water using only solar energy</title><url>http://news.rice.edu/2017/06/19/freshwater-from-salt-water-using-only-solar-energy-2/</url></story>