diff --git a/backend/src/api/pools-parser.ts b/backend/src/api/pools-parser.ts
index 15a4fe7be..29d916376 100644
--- a/backend/src/api/pools-parser.ts
+++ b/backend/src/api/pools-parser.ts
@@ -1,6 +1,7 @@
 import DB from '../database';
 import logger from '../logger';
 import config from '../config';
+import BlocksRepository from '../repositories/BlocksRepository';
 
 interface Pool {
   name: string;
@@ -32,7 +33,6 @@ class PoolsParser {
     // First we save every entries without paying attention to pool duplication
     const poolsDuplicated: Pool[] = [];
 
-    logger.debug('Parse coinbase_tags');
     const coinbaseTags = Object.entries(poolsJson['coinbase_tags']);
     for (let i = 0; i < coinbaseTags.length; ++i) {
       poolsDuplicated.push({
@@ -43,7 +43,6 @@ class PoolsParser {
         'slug': ''
       });
     }
-    logger.debug('Parse payout_addresses');
     const addressesTags = Object.entries(poolsJson['payout_addresses']);
     for (let i = 0; i < addressesTags.length; ++i) {
       poolsDuplicated.push({
@@ -56,7 +55,6 @@ class PoolsParser {
     }
 
     // Then, we find unique mining pool names
-    logger.debug('Identify unique mining pools');
     const poolNames: string[] = [];
     for (let i = 0; i < poolsDuplicated.length; ++i) {
       if (poolNames.indexOf(poolsDuplicated[i].name) === -1) {
@@ -119,8 +117,15 @@ class PoolsParser {
         'slug': slug
       };
 
-      if (existingPools.find((pool) => pool.name === poolNames[i]) !== undefined) {
-        finalPoolDataUpdate.push(poolObj);
+      const existingPool = existingPools.find((pool) => pool.name === poolNames[i]);
+      if (existingPool !== undefined) {
+        // Check if any data was actually updated
+        const equals = (a, b) =>
+          a.length === b.length &&
+          a.every((v, i) => v === b[i]);
+        if (!equals(JSON.parse(existingPool.addresses), poolObj.addresses) || !equals(JSON.parse(existingPool.regexes), poolObj.regexes)) {
+          finalPoolDataUpdate.push(poolObj);
+        }
       } else {
         logger.debug(`Add '${finalPoolName}' mining pool`);
         finalPoolDataAdd.push(poolObj);
@@ -140,40 +145,51 @@ class PoolsParser {
       return;
     }
 
-    logger.debug(`Update pools table now`);
+    if (finalPoolDataAdd.length > 0 || finalPoolDataUpdate.length > 0) {    
+      logger.debug(`Update pools table now`);
 
-    // Add new mining pools into the database
-    let queryAdd: string = 'INSERT INTO pools(name, link, regexes, addresses, slug) VALUES ';
-    for (let i = 0; i < finalPoolDataAdd.length; ++i) {
-      queryAdd += `('${finalPoolDataAdd[i].name}', '${finalPoolDataAdd[i].link}',
-      '${JSON.stringify(finalPoolDataAdd[i].regexes)}', '${JSON.stringify(finalPoolDataAdd[i].addresses)}',
-      ${JSON.stringify(finalPoolDataAdd[i].slug)}),`;
-    }
-    queryAdd = queryAdd.slice(0, -1) + ';';
+      // Add new mining pools into the database
+      let queryAdd: string = 'INSERT INTO pools(name, link, regexes, addresses, slug) VALUES ';
+      for (let i = 0; i < finalPoolDataAdd.length; ++i) {
+        queryAdd += `('${finalPoolDataAdd[i].name}', '${finalPoolDataAdd[i].link}',
+        '${JSON.stringify(finalPoolDataAdd[i].regexes)}', '${JSON.stringify(finalPoolDataAdd[i].addresses)}',
+        ${JSON.stringify(finalPoolDataAdd[i].slug)}),`;
+      }
+      queryAdd = queryAdd.slice(0, -1) + ';';
 
-    // Updated existing mining pools in the database
-    const updateQueries: string[] = [];
-    for (let i = 0; i < finalPoolDataUpdate.length; ++i) {
-      updateQueries.push(`
-        UPDATE pools
-        SET name='${finalPoolDataUpdate[i].name}', link='${finalPoolDataUpdate[i].link}',
-        regexes='${JSON.stringify(finalPoolDataUpdate[i].regexes)}', addresses='${JSON.stringify(finalPoolDataUpdate[i].addresses)}',
-        slug='${finalPoolDataUpdate[i].slug}'
-        WHERE name='${finalPoolDataUpdate[i].name}'
-      ;`);
+      // Updated existing mining pools in the database
+      const updateQueries: string[] = [];
+      for (let i = 0; i < finalPoolDataUpdate.length; ++i) {
+        updateQueries.push(`
+          UPDATE pools
+          SET name='${finalPoolDataUpdate[i].name}', link='${finalPoolDataUpdate[i].link}',
+          regexes='${JSON.stringify(finalPoolDataUpdate[i].regexes)}', addresses='${JSON.stringify(finalPoolDataUpdate[i].addresses)}',
+          slug='${finalPoolDataUpdate[i].slug}'
+          WHERE name='${finalPoolDataUpdate[i].name}'
+        ;`);
+      }
+
+      try {
+        await this.$deleteBlocskToReindex(finalPoolDataUpdate);
+
+        if (finalPoolDataAdd.length > 0) {
+          await DB.query({ sql: queryAdd, timeout: 120000 });
+        }
+        for (const query of updateQueries) {
+          await DB.query({ sql: query, timeout: 120000 });
+        }
+        await this.insertUnknownPool();
+        logger.info('Mining pools.json import completed');
+      } catch (e) {
+        logger.err(`Cannot import pools in the database`);
+        throw e;
+      }
     }
 
     try {
-      if (finalPoolDataAdd.length > 0) {
-        await DB.query({ sql: queryAdd, timeout: 120000 });
-      }
-      for (const query of updateQueries) {
-        await DB.query({ sql: query, timeout: 120000 });
-      }
       await this.insertUnknownPool();
-      logger.info('Mining pools.json import completed');
     } catch (e) {
-      logger.err(`Cannot import pools in the database`);
+      logger.err(`Cannot insert unknown pool in the database`);
       throw e;
     }
   }
@@ -201,6 +217,32 @@ class PoolsParser {
       logger.err('Unable to insert "Unknown" mining pool');
     }
   }
+
+  /**
+   * Delete blocks which needs to be reindexed
+   */
+   private async $deleteBlocskToReindex(finalPoolDataUpdate: any[]) {
+    const blockCount = await BlocksRepository.$blockCount(null, null);
+    if (blockCount === 0) {
+      return;
+    }
+
+    for (const updatedPool of finalPoolDataUpdate) {
+      const [pool]: any[] = await DB.query(`SELECT id, name from pools where slug = "${updatedPool.slug}"`);
+      if (pool.length > 0) {
+        logger.notice(`Deleting blocks from ${pool[0].name} mining pool for future re-indexing`);
+        await DB.query(`DELETE FROM blocks WHERE pool_id = ${pool[0].id}`);
+      }
+    }
+
+    // Ignore early days of Bitcoin as there were not mining pool yet
+    logger.notice('Deleting blocks with unknown mining pool from height 130635 for future re-indexing');
+    const [unknownPool] = await DB.query(`SELECT id from pools where slug = "unknown"`);
+    await DB.query(`DELETE FROM blocks WHERE pool_id = ${unknownPool[0].id} AND height > 130635`);
+
+    logger.notice('Truncating hashrates for future re-indexing');
+    await DB.query(`DELETE FROM hashrates`);
+  }
 }
 
 export default new PoolsParser();