The best replacement for phosphate is phosphorus.

The best alternatives to phosphate are rated as following:
★★★★★  phosphorus
★★  potash
★  phosphite
★  calcium carbonate
★  sulfate
★  creatine monohydrate
★  nickel boron
★  codeine sulfate
★  calcium citrate
★  melonite
★  black oxide
★  calcium
★  phosphoryl
★  monohydrate
★  inorganic phosphate
★  orthophosphate
★  nitrate
  iron phosphate
  arsenic
  phosphide
  codeine
  zinc phosphate
  dihydrocodeine
  phosphate
  phosphoric acid
  chromate
  sodium nitrate
  co-codamol
  etoposide
  lithium ion
  sugar dna
  phosphonate
  benzoyl
  parkerized
  l-ascorbic acid
  citrate
  potassium chloride
  carbonate
  total phosphorus
  pyrophosphate
  monoammonium phosphate
  reactive phosphate

Your alternative for phosphate is not listed? Suggest!
Speaking about phosphate, one probably shouldn't forget about ammonium molybdate.

Other search terms related to phosphate and their ratings are:
★★★★★ ammonium molybdate
★★★ paracetamol
★★ ammonium molybdate reaction
★★ molybdate
★ silver nitrate
dish detergent
phosphate
pectin
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Google Trends

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phosphate
phosphorus
potash