{"id":7967,"date":"2026-02-18T17:13:36","date_gmt":"2026-02-18T17:13:36","guid":{"rendered":"https:\/\/www.caffecampetelli.com\/coffee-blog\/water-and-coffee-a-practical-guide-to-tds-for-domestic-use\/"},"modified":"2026-03-23T15:54:25","modified_gmt":"2026-03-23T15:54:25","slug":"water-and-coffee-a-practical-guide-to-tds-for-domestic-use","status":"publish","type":"post","link":"https:\/\/www.caffecampetelli.com\/en\/coffee-blog-en\/water-and-coffee-a-practical-guide-to-tds-for-domestic-use\/","title":{"rendered":"Water and coffee: a practical guide to TDS for domestic use"},"content":{"rendered":"\n<p>Water is the main ingredient in coffee and determines how much of the flavors in the ground coffee will actually end up in the cup. The most useful parameter to know at home is the <strong>TDS<\/strong>: it helps you choose the right water without professional tools, just by reading the label. Here you will find simple explanation, recommended ranges, and practical procedures for pods, mocha, and domestic espresso.  <\/p>\n\n<h2 class=\"wp-block-heading alignfull\">What is TDS (and how does it differ from hardness)<\/h2>\n\n<p><strong>TDS<\/strong><em>(Total Dissolved Solids<\/em>) indicates the total amount of <strong>salts and minerals dissolved<\/strong> in water, expressed in ppm (mg\/L). In Italy, you find a very close value on the label: the <strong>fixed residue at 180\u00b0C<\/strong>. <strong>Hardness<\/strong> measures mainly calcium and magnesium (\u00b0dH). It is related to TDS but not identical: you can have &#8220;average&#8221; TDS with correct hardness or high TDS because of bicarbonates\/carbonates that make the cup more bitter. For home use you&#8217;d better aim for <strong>TDS 80-120 ppm<\/strong> and <strong>hardness 3-6 \u00b0dH<\/strong>: balance between <strong>sweetness, creaminess and cleanliness<\/strong>.    <\/p>\n\n<h2 class=\"wp-block-heading alignfull\">How to choose water by reading only the label<\/h2>\n\n<p>Check three items: <strong>fixed residue<\/strong>, <strong>bicarbonates<\/strong>, <strong>sodium<\/strong>. The label already tells you whether that water will enhance the coffee, considering the <strong>fixed residue<\/strong> as an <strong>indirect indicator of TDS<\/strong>, <strong>bicarbonates<\/strong> to balance acidity and bitterness, and <strong>sodium<\/strong> to avoid perceptible savoriness. For daily use, a fixed residue between <strong>120-180 mg\/L<\/strong> works; for brighter single-origins, look for <strong>80-120 mg\/L<\/strong>; for more body <strong>180-250 mg\/L<\/strong>, accepting an increased risk of bitterness and limestone. Avoid waters <strong>&lt;50 mg\/L<\/strong>, often flat, and <strong>&gt;300 mg\/L<\/strong>, prone to bitterness and scale, always choosing according to the method used and the <strong>yield<\/strong> you wish to achieve in the cup.   <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Light but lively<\/strong>: fixed residue ~80-120<strong>mg\/L<\/strong> \u2192 crisp aromas, brighter acidity.<\/li>\n\n\n\n<li><strong>Daily balanced<\/strong>: <strong>120-180 mg\/L<\/strong> \u2192 good sweetness and creaminess, balanced profile.<\/li>\n\n\n\n<li><strong>Body and cream<\/strong>: <strong>180-250 mg\/L<\/strong> \u2192 more structure, but increases risk of bitterness and scaling. Avoid waters <strong>&lt;50 mg\/L<\/strong> (flat cups) and <strong>&gt;300 mg\/L<\/strong> (easy bitterness and scaling). <\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading alignfull\">Practical solutions without tools<\/h3>\n\n<p>You can get coffee-friendly water without dedicated tools by working with what you have at home and in the supermarket, combining bottles with different fixed residuals to arrive at a balanced TDS. The carafe filter helps when you start with hard water, but it can deplete the cup; reintroduce a proportion of unfiltered water, start with twenty percent and evaluate the taste. If you use chlorine-smelling tap water, let it decant a few hours in a carafe or use activated carbon, then try three identical extractions to confirm sweetness, creaminess, and cleanliness.  <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>50\/50 mix<\/strong>: combine a &#8220;light&#8221; (80-120) and a &#8220;medium&#8221; (160-200) to get 120-150 mg\/L.<\/li>\n\n\n\n<li><strong>Pitcher filter<\/strong>: if you start with hard water, filter it; if the coffee becomes &#8220;flat,&#8221; reintroduce <strong>10-20%<\/strong> unfiltered water.<\/li>\n\n\n\n<li><strong>Chlorinated tap<\/strong>: let decant 2-3 hours in jug or use activated carbon filter.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading alignfull\">Recommended parameters by method<\/h3>\n\n<p>Different extraction methods want different waters to express the best: balancing TDS and hardness optimizes crema, sweetness, and cleanliness, reducing bitterness or pungent acidity right from the first cup. With ESE pods and domestic espresso, light-medium waters work, favoring emulsion and consistency; mocha likes a slightly higher TDS to give more body without pushing bitterness and astringency. Use ranges as guidelines and correct with label; ESE and espresso yield between 80-120 ppm with hardness 3-6 \u00b0dH, while mocha prefers 100-150 ppm for balance and roundness.  <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>44 mm ESE pods<\/strong>: <strong>TDS 80-120 ppm<\/strong>, hardness 3-6 \u00b0dH. Stabilizes cream and reduces channeling.   <\/li>\n\n\n\n<li><strong>Mocha<\/strong>: <strong>TDS 100-150 ppm.<\/strong> Increase the body a little without pushing the bitterness. <\/li>\n\n\n\n<li><strong>Domestic espresso<\/strong>: <strong>TDS 90-130 ppm<\/strong> and hardness 3-6 \u00b0dH. Good emulsion and sweetness. <\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading alignfull\">Sensory test in 3 cups (5 minutes)<\/h3>\n\n<p>A simple test lets you figure out which water really enhances your coffee by changing only the bottle and keeping all other extraction parameters identical. Brew three equal cups with different waters and evaluate natural sweetness, crema stability, post-sip bitterness, and aromatic clarity to compare results objectively. Choose the water that maximizes balance and cleanliness, then note brand and fixed residue so you can easily replicate the yield each time you change bottles or home filters.  <\/p>\n\n<ol class=\"wp-block-list\">\n<li>&#8220;light&#8221; (80-120),  2) &#8220;medium&#8221; (120-180), 3) <strong>50\/50 mix<\/strong>.<br\/>Evaluate in order: <strong>natural sweetness<\/strong>, <strong>creaminess<\/strong>, <strong>bitterness post-sip<\/strong>, <strong>aromatic clarity<\/strong>. Choose the water that maximizes sweetness and cleanliness with stable cream.  <\/li>\n<\/ol>\n\n<h3 class=\"wp-block-heading alignfull\">Quick fixes if something doesn&#8217;t add up<\/h3>\n\n<p>When the cup is not convincing, first intervene on the water instead of the machine or pods, because a few points of TDS or hardness can drastically change sweetness, creaminess, and cleanliness. Watch the signs in the cup and apply targeted corrections, reducing or increasing the fixed residue, choosing profiles with different bicarbonates, or mixing two waters to achieve a more stable balance. Take small steps and test with two or three consecutive extractions, keeping volume and time constant, so you isolate the effect of water and turn improvement into a replicable choice.  <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Bitter\/&#8221;cooked&#8221;:<\/strong> go down <strong>20-40 ppm<\/strong> (lighter water or less bicarbonates).<\/li>\n\n\n\n<li><strong>Flat\/uncreamed<\/strong>: raise <strong>20-40 ppm<\/strong> (mix with more &#8220;average&#8221; water).<\/li>\n\n\n\n<li><strong>Pungent acidity<\/strong>: use <strong>medium<\/strong> water with somewhat higher bicarbonates.<\/li>\n\n\n\n<li><strong>Visible limestone<\/strong>: filter or change brand and <strong>descale<\/strong> the machine. If problems persist, switch to <a href=\"https:\/\/www.caffecampetelli.com\/en\/coffee-blog-en\/troubleshooting-ese-pods-15-common-problems-and-quick-fixes\/\" target=\"_blank\" rel=\"noreferrer noopener\">Troubleshooting ESE pods<\/a>. <\/li>\n<\/ul>\n\n<table style=\"width:100%;border-collapse:collapse;border:1px solid #ececec\">\n  <thead>\n    <tr>\n      <th style=\"padding:10px;border:1px solid #ececec;background:#fafafa;text-align:left\">Water profile<\/th>\n      <th style=\"padding:10px;border:1px solid #ececec;background:#fafafa;text-align:left\">In-cup effect<\/th>\n      <th style=\"padding:10px;border:1px solid #ececec;background:#fafafa;text-align:left\">Suggested use<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td style=\"padding:10px;border:1px solid #ececec\">Light (RF 80-120 mg\/L)<\/td>\n      <td style=\"padding:10px;border:1px solid #ececec\">Sharp aromas, less body<\/td>\n      <td style=\"padding:10px;border:1px solid #ececec\">Sour single-origin, light filter, mild ESE<\/td>\n    <\/tr>\n    <tr>\n      <td style=\"padding:10px;border:1px solid #ececec\">Medium (RF 120-180 mg\/L)<\/td>\n      <td style=\"padding:10px;border:1px solid #ececec\">Sweetness\/cream balance<\/td>\n      <td style=\"padding:10px;border:1px solid #ececec\">Daily use, mocha, ESE balanced<\/td>\n    <\/tr>\n    <tr>\n      <td style=\"padding:10px;border:1px solid #ececec\">Medium-high (RF 180-250 mg\/L)<\/td>\n      <td style=\"padding:10px;border:1px solid #ececec\">More body, bitter risk<\/td>\n      <td style=\"padding:10px;border:1px solid #ececec\">Blend with Robusta, short espresso<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n\n<h2 class=\"wp-block-heading alignfull\">FAQ<\/h2>\n\n<h3 class=\"wp-block-heading alignfull\"><strong>What is TDS and how do I read it on the label?<\/strong><\/h3>\n\n<p>It is the sum of dissolved solids (mg\/L \u2248 ppm). On the label it uses the <strong>fixed residue at 180 \u00b0C<\/strong> as a proxy for TDS. Values in the <strong>80-120<\/strong> range offer cleanliness and sweetness; above <strong>180-200<\/strong> increase body and cream but also increase the risk of bitterness and scale.  <\/p>\n\n<h3 class=\"wp-block-heading alignfull\"><strong>Can I use tap water?<\/strong><\/h3>\n\n<p>Yes, if it is not too hard or chlorinated. If you smell chlorine, let it decant or use a carbon filter. If you live in an area with <strong>hard water<\/strong>, consider a filter jug and a <strong>mixture 80% filtered + 20% unfiltered<\/strong> so as not to &#8220;drain&#8221; the cup.  <\/p>\n\n<h3 class=\"wp-block-heading alignfull\"><strong>Why does the cream change with different waters?<\/strong><\/h3>\n\n<p>Calcium and magnesium ions affect emulsion and extraction: too few \u2192 thin cream; too many \u2192 dark cream and bitter taste. The <strong>3-6 \u00b0dH<\/strong> range with <strong>TDS 80-120<\/strong> is a good compromise for waffles and domestic espresso. <\/p>\n\n<h3 class=\"wp-block-heading alignfull\"><strong>What is the difference between pods, mocha and espresso?<\/strong><\/h3>\n\n<p><strong>Mocha<\/strong> benefits from slightly higher TDS<strong>(100-150<\/strong>) to increase body. <strong>ESE pods<\/strong> and<strong>domestic espresso<\/strong> yield best between <strong>80-120<\/strong> with hardness 3-6 \u00b0dH: stable crema, sweetness and cleanliness. For the basics of compatibility and yield see <a href=\"https:\/\/www.caffecampetelli.com\/en\/coffee-blog-en\/ese-44-mm-pods-complete-guide-to-compatibility-and-cup-yields\/\" target=\"_blank\" rel=\"noreferrer noopener\">44 mm ESE pods: compatibility and yield<\/a>.  <\/p>\n\n<h3 class=\"wp-block-heading alignfull\"><strong>Should I change the frequency of descaling if I change water?<\/strong><\/h3>\n\n<p>Yes. With &#8220;average&#8221; water you extend the intervals; with hard water you will have to descale more often. If you notice jerky flow or poor cream, anticipate maintenance and consult the dedicated maintenance guide or Troubleshooting ES pods.  <\/p>\n\n<script type=\"application\/ld+json\">{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"BlogPosting\",\n  \"headline\":\"Acqua e caff\u00e8: guida pratica ai TDS per uso domestico\",\n  \"description\":\"Come scegliere l\u2019acqua giusta (TDS\/durezza) per cialde, moka ed espresso a casa.\",\n  \"author\":{\"@type\":\"Organization\",\"name\":\"Caff\u00e8 Campetelli\"},\n  \"publisher\":{\"@type\":\"Organization\",\"name\":\"Caff\u00e8 Campetelli\"},\n  \"image\":\"URL_COVER_ARTICOLO\",\n  \"datePublished\":\"2026-01-28\",\n  \"mainEntityOfPage\":\"URL_ARTICOLO\"\n}\n<\/script>\n\n<script type=\"application\/ld+json\">{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"FAQPage\",\n  \"mainEntity\":[\n    {\"@type\":\"Question\",\"name\":\"Cos\u2019\u00e8 il TDS e come lo leggo in etichetta?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Il TDS indica i sali disciolti (mg\/L\u2248ppm). In etichetta usa il residuo fisso a 180 \u00b0C come proxy del TDS. Il range 80\u2013120 offre pulizia e dolcezza; oltre 180\u2013200 cresce il rischio di amaro e calcare.\"}},\n    {\"@type\":\"Question\",\"name\":\"Posso usare l\u2019acqua del rubinetto?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"S\u00ec, se non \u00e8 troppo dura o clorata. In caso di cloro, lascia decantare o usa un filtro a carbone. Con acqua dura, caraffa filtrante e mix 80% filtrata + 20% non filtrata.\"}},\n    {\"@type\":\"Question\",\"name\":\"Perch\u00e9 con acque diverse la crema cambia?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Gli ioni Ca\/Mg influenzano emulsione ed estrazione: pochi ioni \u2192 crema sottile; troppi \u2192 crema scura e gusto amaro. Range consigliato: durezza 3\u20136 \u00b0dH e TDS 80\u2013120 ppm.\"}},\n    {\"@type\":\"Question\",\"name\":\"Che differenza fa tra cialde, moka ed espresso?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"La moka beneficia di TDS 100\u2013150 per pi\u00f9 corpo. Cialde ESE ed espresso domestico rendono meglio 80\u2013120 con durezza 3\u20136 \u00b0dH.\"}},\n    {\"@type\":\"Question\",\"name\":\"Devo cambiare la frequenza di decalcifica se cambio acqua?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"S\u00ec. Acque medie allungano gli intervalli; acque dure richiedono decalcifiche pi\u00f9 frequenti. Se noti flusso a scatti o crema scarsa, anticipa la manutenzione.\"}}\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Water is the main ingredient in coffee and determines how much of the flavors in the ground coffee will actually end up in the cup. The most useful parameter to know at home is the TDS: it helps you choose the right water without professional tools, just by reading the label. Here you will find [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7953,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239],"tags":[217,236,238,225],"class_list":["post-7967","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coffee-blog-en","tag-capsules","tag-ground-coffee","tag-minced","tag-single-origin"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/posts\/7967","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/comments?post=7967"}],"version-history":[{"count":1,"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/posts\/7967\/revisions"}],"predecessor-version":[{"id":7968,"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/posts\/7967\/revisions\/7968"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/media\/7953"}],"wp:attachment":[{"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/media?parent=7967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/categories?post=7967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.caffecampetelli.com\/en\/wp-json\/wp\/v2\/tags?post=7967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}