div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentnspi-newsletter-swimming-pool-filter-the-filter-is-designed-to-use-silica-sandhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: NSPI Newsletter - Swimming Pool Consultant · filter The filter is designed to use silica sand which has an effective particle size of 45 mm and a uniformity coefficient of 15 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader035fdocumentsinreader035viewer20220710235fd74c73f1db046497414fb4html5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=documentnspi-newsletter-swimming-pool-filter-the-filter-is-designed-to-use-silica-sandhtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: NSPI Newsletter - Swimming Pool Consultant · filter The filter is designed to use silica sand which has an effective particle size of 45 mm and a uniformity coefficient of 15 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader035fdocumentsinreader035viewer20220710235fd74c73f1db046497414fb4html5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=documentnspi-newsletter-swimming-pool-filter-the-filter-is-designed-to-use-silica-sandhtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: NSPI Newsletter - Swimming Pool Consultant · filter The filter is designed to use silica sand which has an effective particle size of 45 mm and a uniformity coefficient of 15 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII=...