Changes

*<strong>Micro- or Ultra- filtration</strong> uses such fine membranes that the vast majority of harmful viruses, bacteria etc. are excluded from the water directly.  

*<strong>Micro- or Ultra- filtration</strong> uses such fine membranes that the vast majority of harmful viruses, bacteria etc. are excluded from the water directly.  

All three water purification technologies require specialist design and consultation with a subject matter expert is recommended for higher tiers of water use.

All three water purification technologies require specialist design and consultation with a subject matter expert is recommended for higher tiers of water use.

{|class="wikitable"

{|class="wikitable"

|+ Water quality treatment required for multi-residential and commercial applications (Abridged from [https://www.iccsafe.org/wp-content/uploads/110116-Draft-CSA_ICC-B805-Rainwater-Harvesting.pdf CSA B805 draft])

|+ Water quality treatment required for multi-residential and commercial applications (Abridged from [https://www.iccsafe.org/wp-content/uploads/110116-Draft-CSA_ICC-B805-Rainwater-Harvesting.pdf CSA B805 draft])

*Rooftop cooling}}

*Rooftop cooling}}

|0||99%||99%||99.99%||99.99%||99.9%

|0||99%||99%||99.99%||99.99%||99.9%

|}

|}

===Source Water Quality===

A study of many types of roof surfaces in Texas found:

|colspan=6 style="text-align: center;"|

*'Cool' membrane, concrete tile, and metal roofs all produced water of similar good quality for non-potable use,

      <tr><td>HVAC systems</td><td colspan=6 style="text-align: center;">In accordance with [https://www.ashrae.org/resources--publications/bookstore/ansi-ashrae-standard-188-2015-legionellosis-risk-management-for-building-water-systems ASHRAE 188] </td></tr>

*The runoff water from asphalt shingle and green roofs contained significantly more dissolved organic carbon (DOC). The DOC can add a  yellow colour to the water. If the water is treated with chlorine, for drinking purposes, DOC can produce toxic compounds<ref>Mendez CB, Klenzendorf JB, Afshar BR, et al. The effect of roofing material on the quality of harvested rainwater. Water Res. 2011;45(5):2049-2059. doi:10.1016/j.watres.2010.12.015.</ref>.

Research in Hamilton, ON assessed the water quality of rain collected from three highly reflective 'cool roof' membranes<ref>Cupido, A., B. Baetz, Y. Guo, and A. Robertson. 2012. An evaluation of rainwater runoff quality from selected white roof membranes. doi: 10.2166/wqrjc.2012.011.</ref>. Key findings:

*The water was free from significant contamination with by-products of plastic manufacture and did not show elevated levels of the five metals tested.  

      <tr><td>4</td><td style="text-align: left"> Human consumption <br>Oral care <br>Food preparation <br>Dish-washing <br>Bathing, showering, and hand washing <br>Pool/hot

*Increased microbiological contamination was found in runoff from roof areas where ponding occurred.

      tubs/spas/splash pads <br>Misting stations <br>Swamp coolers </td><td>0</td><td>99.999%</td><td>99.999%</td><td colspan=3 style="text-align: center;">Outside of the scope of

Note: Increased microbiological contamination in roof runoff is also associated with warmer weather <ref>Vialle C, Sablayrolles C, Lovera M, Jacob S, Huau MC, Montrejaud-Vignoles M. Monitoring of water quality from roof runoff: Interpretation using multivariate analysis. Water Res. 2011;45(12):3765-3775. doi:10.1016/j.watres.2011.04.029.</ref>.

 

<p> A study of many types of roof surfaces in Texas found:

<li>'Cool' membrane, concrete tile, and metal roofs all produced water of similar good quality for non-potable use, </li>

<li>The runoff water from asphalt shingle and green roofs contained significantly more dissolved organic carbon (DOC). The DOC can add a  yellow colour to the water. If the water is treated with chlorine, for drinking purposes, DOC can produce toxic compounds[http://www.sciencedirect.com/science/article/pii/S0043135410008535]. </li>

<p> Research in Hamilton, ON assessed the water quality of rain collected from three highly reflective 'cool roof' membranes[http://wst.iwaponline.com/content/70/7/1205?utm_source=TrendMD&utm_medium=cpc&utm_campaign=Water_Science_and_Technology_TrendMD_0]. Key findings:

<ul><li>The water was free from significant contamination with by-products of plastic manufacture and did not show elevated levels of the five metals tested. </li>

<li>Increased microbiological contamination was found in runoff from roof areas where ponding occurred.</li> 

<p>Increased microbiological contamination in roof runoff is also associated with warmer weather[http://www.sciencedirect.com/science/article/pii/S0043135411002181].</p>