{
 "slug": "aquarium-substrate",
 "name": "Aquarium Substrate",
 "root": "pet",
 "unit": "kg",
 "unit_as_designed": "g",
 "unit_note": "Use the net substrate mass in grams, converting listed weights and summing the net mass of all packs. For volume-only listings, use an explicitly stated net mass if available; do not infer mass from volume without a product-specific density.",
 "gpc": {
  "brick_code": "10000516",
  "brick": "Aquarium Aids/Accessories",
  "class": "Pet Accessories",
  "family": "Pet Care",
  "segment": "Pet Care/Food"
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 "google_product_category": {
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  "path": "Animals & Pet Supplies > Pet Supplies > Fish Supplies > Aquarium Gravel & Substrates"
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 "taxonomy": {
  "shopify": {
   "id": "gid://shopify/TaxonomyCategory/ap-2-4-7",
   "path": "Animals & Pet Supplies > Pet Supplies > Fish & Aquatic Supplies > Aquarium Gravel & Substrates",
   "attributes": [
    {
     "name": "Color",
     "handle": "color",
     "values": [
      "Beige",
      "Black",
      "Blue",
      "Bronze",
      "Brown",
      "Clear",
      "Gold",
      "Gray",
      "Green",
      "Multicolor",
      "Navy",
      "Orange",
      "Pink",
      "Purple",
      "Red",
      "Rose gold",
      "Silver",
      "White",
      "Yellow"
     ]
    },
    {
     "name": "Gravel/Substrate material",
     "handle": "gravel-substrate-material",
     "values": [
      "Clay",
      "Coral",
      "Glass",
      "Quartz",
      "Stone",
      "Other"
     ]
    },
    {
     "name": "Pattern",
     "handle": "pattern",
     "values": [
      "Abstract",
      "Animal",
      "Art",
      "Bead & reel",
      "Birds",
      "Brick",
      "Bull's eye",
      "Camouflage",
      "Characters",
      "Checkered",
      "Chevron",
      "Chinoiserie",
      "Christmas",
      "Collage",
      "Coral",
      "Damask",
      "Diagonal",
      "Diamond",
      "Dog's tooth",
      "Dots",
      "Egg & dart",
      "Ethnic",
      "Everlasting knot",
      "Floral",
      "Fret",
      "Geometric",
      "Guilloche",
      "Hearts",
      "Illusion",
      "Lace"
     ]
    },
    {
     "name": "Substrate features",
     "handle": "substrate-features",
     "values": [
      "Beneficial bacteria growth",
      "Coated",
      "Natural product",
      "Neutral pH",
      "Pre-washed",
      "Other"
     ]
    }
   ]
  },
  "google": {
   "id": 5021,
   "path": "Animals & Pet Supplies > Pet Supplies > Fish Supplies > Aquarium Gravel & Substrates"
  },
  "gpc": {
   "brick_code": "10000516",
   "brick": "Aquarium Aids/Accessories",
   "class": "Pet Accessories",
   "family": "Pet Care",
   "segment": "Pet Care/Food"
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 },
 "fields": [
  {
   "key": "substrate_form",
   "label": "Substrate form",
   "type": "enum",
   "unit": null,
   "values": [
    "sand",
    "gravel",
    "soil",
    "other"
   ],
   "why_it_matters": "Grain form affects habitat suitability, planting, and maintenance."
  },
  {
   "key": "gravel_substrate_material",
   "label": "Gravel/substrate material",
   "type": "enum",
   "unit": null,
   "values": [
    "clay",
    "coral",
    "glass",
    "quartz",
    "stone",
    "other"
   ],
   "why_it_matters": "Material affects durability, water chemistry, and suitability for aquatic life."
  },
  {
   "key": "grain_size_mm",
   "label": "Grain size",
   "type": "number",
   "unit": "mm",
   "values": null,
   "why_it_matters": "Grain size affects plant rooting, waste trapping, and suitability for bottom-dwelling animals."
  },
  {
   "key": "color",
   "label": "Color",
   "type": "enum",
   "unit": null,
   "values": [
    "beige",
    "black",
    "blue",
    "bronze",
    "brown",
    "clear",
    "gold",
    "gray",
    "green",
    "multicolor",
    "navy",
    "orange"
   ],
   "why_it_matters": "Color is an aesthetic choice and can meaningfully affect price."
  },
  {
   "key": "neutral_ph",
   "label": "Neutral pH",
   "type": "boolean",
   "unit": null,
   "values": null,
   "why_it_matters": "Indicates whether the substrate is intended not to shift aquarium pH."
  },
  {
   "key": "pre_washed",
   "label": "Pre-washed",
   "type": "boolean",
   "unit": null,
   "values": null,
   "why_it_matters": "Can reduce preparation time and initial cloudiness."
  },
  {
   "key": "beneficial_bacteria_growth",
   "label": "Beneficial bacteria growth",
   "type": "boolean",
   "unit": null,
   "values": null,
   "why_it_matters": "Substrates designed to support beneficial bacteria may aid biological filtration."
  },
  {
   "key": "coated",
   "label": "Coated",
   "type": "boolean",
   "unit": null,
   "values": null,
   "why_it_matters": "A coating can affect durability, appearance, and compatibility with aquarium inhabitants."
  }
 ],
 "minimum_spec": {
  "description": "For a general-purpose aquarium, choose substrate explicitly intended for aquarium use that is compatible with the tank's inhabitants and water chemistry. A neutral-pH product is a broadly suitable baseline; specialized tanks may require a substrate that deliberately changes pH.",
  "rules": [
   {
    "key": "neutral_ph",
    "op": "true",
    "value": true
   }
  ]
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 "baseline": {
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  "name": "CaribSea Ocean Direct",
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    "unit": "g"
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   "unit_price_unit": "kg",
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   "standard_attributes": {
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   "size_missing": false,
   "unranked_reason": null,
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     "availability": "In Stock",
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     "seller": "HAVE A GREAT DAY!",
     "first_party": false,
     "shipping": {
      "text": "FREE delivery",
      "price": 0.0
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     "size_text": "20lb (Pack of 2)",
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     "observed_at": "2026-10-10T09:36:30-04:00",
     "age_minutes_at_build": 17447
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   "html": "/items/227961.html",
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  {
   "id": 227960,
   "name": "Pisces USA Aragonite",
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   "lowest_price": {
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     "observed_at": "2026-10-10T09:36:23-04:00",
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    "pct_over_baseline": 26.8,
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  },
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   "name": "Ultum Nature Systems Controsand Bora white",
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     "shipping": {
      "text": "FREE delivery",
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     "size_text": "8L",
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     "observed_at": "2026-10-10T09:18:17-04:00",
     "age_minutes_at_build": 17465
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   ],
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   "html": "/items/227959.html",
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   "lowest_price": {
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   "name": "LANDEN Namale",
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