and 313 respectively clean water line 320 and displacement pump 335 brings clean water to each of tanks 311 312 and 313 via branches 321 322 and 323 the clean water line 320 also has an optional branch past valve 324 through dilution pump 330 thus adding diluent to high concentration proppant carrier fluid line 340 if needed clean water mixes in tanks 311 312 and 313 with proppant from hoppers 301 302 and 303 and proppant slurry exits through a slurry line 344 via branches 341 342 and 343 from the respective tanks to the proppant carrier fluid line 340 and from there the final fracturing fluid labeled u201c final slurry u201d is delivered to the well off to the right overflow line 350 allows clean fluid in an upstream tank to feed into a downstream tank thus allowing space in the upstream tank for proppant to be added thereto thus branches 351 352 and 353 allow used fluid to combine with the clean water to fill or displace a given tank recycle line 360 allows for excess clean fluid to be emptied from a tank before proppant has been added and recycled as makeup water in e g slurry stream fluid injection stream and the like thus branches 361 362 and 363 allow for clean fluid to be displaced from each tank and pumped into.