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Abstract

A pH-neutral aqueous solution of a quinolonecarboxylic acid of the formula ##STR1## in which R.sup.1 represents halogen, C.sub.1-4 -alkyl or C.sub.2-4 -alkenyl, R.sup.2 and R.sup.3 represent hydrogen, C.sub.1-4 -alkyl, or together the adjacent nitrogen atom form an optionally substituted morpholine or piperazine ring, R.sup.4 represents optionally substituted C.sub.1-4 -alkyl or C.sub.3-6 -cycloalkyl, X represents --N.dbd.or --CR.sup.5 .dbd., and R.sup.5 represents hydrogen, halogen, OH or C.sub.1-4 -alkyl, or R.sup.4 and R.sup.5, together with the C and N atoms position between them, form a saturated 5- or 6-membered ring which can contain other hetero atoms and which is optionally substituted, the solution containing calcium ions in at least an equimolar amount relative to the quinolonecarboxylic acid and having a pH between about 6.5 and 7.5. The solution is prepared by reacting the quinolonecarboxylic acid in water with a water-soluble calcium compound in at least an equimolar ratio and subsequently adjusting the pH of the solution to a value between about 6.5 and 7.5. The solutions are especially suited for treating eggs and drinking water.

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