That is the good news. But the hope of fusioneers, of course, is that despite this low concentration, it will be so easy just to pump seawater through some kind of lithium extractor, that we'll be awash is easily obtained lithium, with no need for any mining, and everything will be great. Meanwhile the energy needed to boil that liter is 2.3 megajoules. But actually, a considerable fraction of the neutrons will necessarily be lost, hence NOT all the needed tritium could be supplied by this means. It won't be cheap.
Fast neutrons turn everything they touch radioactive or busted.
The JET power 13 MW record I mentioned before was achieved at a plant cost of billions, thus the plant cost was over 100 times larger per megawatt than commercial power plants. Thus, really, it would seem the capital costs of fusion plants per watt of generating capacity will be over 10000 times more expensive than conventional power plants, and the maintenance and design costs will also be enormous. And I've already discussed the hazards of tritium. Just give us 10 more years. After 50 years of such claims, it is time to shut up.