Need suggestions for removing hard water deposits from GI pipes

Hi,

We have a borewell in our house. Of late we found out that the water flow has reduced inspite of the overhead (concrete) water tank remaining full. The plumber told us that salt has accumulated in the pipes. He also said that if acid is used then all the deposits will get accumulated at one spot and worsen the pipeline.

We are using GI pipes. The worst part is that they are concealed and cannot be removed. Can any one suggest on how these salt deposits can be removed from the concealed pipes without breaking down any concrete work.

Any suggestions will be very useful

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