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SUMMARY The principles underlying the aluminium hydroxide gel treatment of phosphatic calculi have been outlined. A new preparation called Hyalgel has been tried on a small series of urinary stone patients and its effect has been studied on the lowering of the urinary phosphate level, the size of renal calculi and the prevention of recurrent stones. Some difficulties in the application of this treatment have been discussed. Our preliminary results are given and compared with the more significant results of American writers.
Pyrah et al. (1956) studied this question.