https://www.criticalmasssystems.co.uk/collections/frontpage 2023-03-21T19:26:42+00:00 daily https://www.criticalmasssystems.co.uk/collections/lighting 2026-05-07T20:09:42+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/lighting.png?v=1595410723 Propagation Lighting https://www.criticalmasssystems.co.uk/collections/fan-controllers 2026-02-11T12:05:01+00:00 daily https://www.criticalmasssystems.co.uk/collections/cdm-lighting 2026-05-07T20:10:03+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/cdm_connect.png?v=1595410159 CDM Lighting https://www.criticalmasssystems.co.uk/collections/led-lighting 2026-05-07T20:10:14+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/maxi_LED.jpg?v=1595410335 LED Lighting - Contact us for the best LED prices! https://www.criticalmasssystems.co.uk/collections/hid-lighting 2026-05-14T17:42:14+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/gavita_greenhouse.jpg?v=1595411327 HID Lighting https://www.criticalmasssystems.co.uk/collections/ballasts 2026-05-07T20:10:11+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/cdm_ballast.jpg?v=1595411697 Ballasts https://www.criticalmasssystems.co.uk/collections/refelectors 2026-05-07T20:10:04+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/avenger.jpg?v=1595411934 Lighting Reflectors https://www.criticalmasssystems.co.uk/collections/spare-lamps-bulbs 2026-05-14T17:42:14+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/son-t.jpg?v=1595412400 Spare Lamps/Bulbs https://www.criticalmasssystems.co.uk/collections/lighting-accessories 2026-05-07T20:10:04+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/rope_ratchets.jpg?v=1595412813 Lighting Accessories https://www.criticalmasssystems.co.uk/collections/timers-and-contactors 2026-05-07T20:10:14+01:00 daily https://www.criticalmasssystems.co.uk/collections/filtration-kits 2023-03-21T19:26:43+00:00 daily https://www.criticalmasssystems.co.uk/collections/carbon-filters 2026-05-07T20:10:04+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/Mountain_Air.jpg?v=1595496580 Carbon Filters https://www.criticalmasssystems.co.uk/collections/growing-media 2026-06-17T12:04:44+01:00 daily https://www.criticalmasssystems.co.uk/collections/coco-media 2026-05-14T19:05:08+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/canna_coco_50l.jpg?v=1653318653 Coco Growing Media https://www.criticalmasssystems.co.uk/collections/soil-organics 2026-05-07T20:10:05+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/all-mix.png?v=1595495751 Soil/Organics https://www.criticalmasssystems.co.uk/collections/standard-filtration-kits 2026-05-07T20:10:05+01:00 daily https://www.criticalmasssystems.co.uk/collections/acoustic-filtration-kits 2026-05-07T20:10:24+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/isomax_fan.png?v=1595498075 Iso-Max Silenced Fan Filtration Kits https://www.criticalmasssystems.co.uk/collections/ventilation-fans 2026-07-07T16:52:25+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/isomax_fan_76015be4-e85d-43b8-9d9a-6dd23e60759e.png?v=1595498596 Ventilation Fans https://www.criticalmasssystems.co.uk/collections/ducting-and-accessories 2026-05-07T20:10:05+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/combi_duct.jpg?v=1595500729 Ducting and Accessories https://www.criticalmasssystems.co.uk/collections/ec-fan-filtration-kits 2023-03-21T19:26:43+00:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/f5e27e85e6602424dc859e39c5a1a4f581769f36.png?v=1595501498 EC Fan Filtration Kits https://www.criticalmasssystems.co.uk/collections/rockwool 2026-06-17T12:04:44+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/hugo_block.jpg?v=1595501845 Rockwool https://www.criticalmasssystems.co.uk/collections/other-media 2026-05-14T19:05:08+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/hydrocorn.jpg?v=1595503688 Clay Pebbles & Other Media https://www.criticalmasssystems.co.uk/collections/humidity-control 2026-07-01T12:04:25+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/hr_15_action.jpg?v=1595504185 Humidity Control https://www.criticalmasssystems.co.uk/collections/heaters-and-accessories 2026-05-07T20:10:30+01:00 daily https://www.criticalmasssystems.co.uk/collections/air-movement-fans 2026-05-15T12:06:06+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/maxi_wall_fan.jpg?v=1608552204 Air Movement Fans https://www.criticalmasssystems.co.uk/collections/propagators 2026-05-19T12:05:54+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/aero_prop.jpg?v=1595507883 Propagators https://www.criticalmasssystems.co.uk/collections/propagation-media-accessories 2026-05-14T18:03:30+01:00 daily https://www.criticalmasssystems.co.uk/collections/propagation-nutrient-boosters 2026-05-14T18:03:30+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/plantstart.jpg?v=1595508687 Propagation Nutrient & Boosters https://www.criticalmasssystems.co.uk/collections/propagation-grow-tents 2026-05-07T20:10:06+01:00 daily https://www.criticalmasssystems.co.uk/collections/propagation-grow-kits-tent-kits 2026-05-07T20:10:06+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/SJ_L90.jpg?v=1595509247 Propagation Grow Kits & Tent kits https://www.criticalmasssystems.co.uk/collections/base-nutrients 2026-06-22T12:33:16+01:00 daily https://www.criticalmasssystems.co.uk/collections/flowering-boosters-additives 2026-05-14T19:05:08+01:00 daily https://www.criticalmasssystems.co.uk/collections/vegetative-boosters-additives 2026-05-14T19:05:08+01:00 daily https://www.criticalmasssystems.co.uk/collections/root-stimulants 2026-06-08T12:03:04+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/aero_roots.jpg?v=1595516786 Root Stimulants https://www.criticalmasssystems.co.uk/collections/beneficial-bacteria-enzymes-and-other-additives 2026-05-14T19:05:08+01:00 daily https://www.criticalmasssystems.co.uk/collections/opening-discount-15-off-everything-for-the-first-week 2023-03-21T19:26:44+00:00 daily https://www.criticalmasssystems.co.uk/collections/grow-tents 2026-05-07T20:10:06+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/Budbox_tent.jpg?v=1653410300 Grow Tents A selection of grow tents from Budbox, Secret Jardin and Trojan, different sizes and qualities to suit all spaces and budgets. Critical Mass Systems https://www.criticalmasssystems.co.uk/collections/sheeting-grow-room-building-accessories 2026-05-07T20:10:15+01:00 daily https://www.criticalmasssystems.co.uk/collections/grow-room-tools 2026-05-29T12:03:55+01:00 daily https://www.criticalmasssystems.co.uk/collections/measuring-equipment 2026-05-29T12:03:55+01:00 daily https://www.criticalmasssystems.co.uk/collections/plant-support 2026-05-07T20:10:44+01:00 daily https://www.criticalmasssystems.co.uk/collections/pest-control-sprays-accessories 2026-05-14T16:18:06+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/spidermite.jpg?v=1595529828 Pest Control Sprays & Accessories https://www.criticalmasssystems.co.uk/collections/organic-cultivation 2023-03-21T19:26:44+00:00 daily https://www.criticalmasssystems.co.uk/collections/organic-nutrients 2026-05-14T17:16:46+01:00 daily https://www.criticalmasssystems.co.uk/collections/organic-growing-media-and-amendments 2026-06-16T12:41:23+01:00 daily https://www.criticalmasssystems.co.uk/collections/nutrient-control-management 2026-05-14T16:58:51+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/ph_scale.jpg?v=1596019180 Nutrient Control &Management https://www.criticalmasssystems.co.uk/collections/hydroponic-systems 2026-05-07T20:10:11+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/stock-photo-roots-in-nutrient-hydroponic-solution-596588960.jpg?v=1601115405 Hydroponic Systems https://www.criticalmasssystems.co.uk/collections/drip-irrigation-systems 2026-05-07T20:10:11+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/drip_window.jpg?v=1596191567 Drip Irrigation Systems https://www.criticalmasssystems.co.uk/collections/pots-saucers-trays-etc 2026-06-16T12:41:23+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/fabric_pots.jpg?v=1596192064 Pots, Saucers, Trays etc https://www.criticalmasssystems.co.uk/collections/drip-system-components 2026-06-16T12:41:23+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/spray_dripper.jpg?v=1596192438 Drip System Components https://www.criticalmasssystems.co.uk/collections/water-butts-reservoirs-tanks 2026-05-14T12:07:18+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/water_butts.jpg?v=1596193092 Water Butts, Reservoirs & Tanks https://www.criticalmasssystems.co.uk/collections/aeration-kits 2026-05-07T20:10:11+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/aeration_bubbles.jpg?v=1596263241 Aeration Kits https://www.criticalmasssystems.co.uk/collections/air-pumps-accessories 2026-05-07T20:10:24+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/bubbles.jpg?v=1596264219 Air Pumps & Accessories https://www.criticalmasssystems.co.uk/collections/irrigation-pumps-accessories 2026-05-07T20:10:11+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/water_jets.jpg?v=1596264423 Irrigation Pumps & Accessories https://www.criticalmasssystems.co.uk/collections/other-system-components 2026-06-16T12:41:23+01:00 daily https://www.criticalmasssystems.co.uk/collections/co2-control 2026-05-07T20:10:11+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/co2_blast.jpg?v=1596269246 Co2 & Control https://www.criticalmasssystems.co.uk/collections/odour-control 2026-05-07T20:10:21+01:00 daily https://www.criticalmasssystems.co.uk/collections/budget-grow-tent-kits 2026-05-07T20:10:12+01:00 daily https://www.criticalmasssystems.co.uk/collections/autopot-systems-accessories 2026-06-10T12:05:20+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/prison_chillies_autopot.jpg?v=1596621911 Autopot Systems & Accessories https://www.criticalmasssystems.co.uk/collections/budbox-pro-white-tent-kits 2026-05-07T20:10:24+01:00 daily https://www.criticalmasssystems.co.uk/collections/disease-control 2026-05-07T20:10:52+01:00 daily https://www.criticalmasssystems.co.uk/collections/pro-led-tent-kits 2026-05-07T20:10:18+01:00 daily https://www.criticalmasssystems.co.uk/collections/grow-tent-accessories 2026-05-07T20:10:26+01:00 daily https://www.criticalmasssystems.co.uk/collections/budbox-lite-tent-kits 2026-05-07T20:10:32+01:00 daily https://www.criticalmasssystems.co.uk/collections/organic-nutrition-amendments 2026-05-14T17:16:46+01:00 daily https://www.criticalmasssystems.co.uk/collections/best-selling-products 2026-01-28T17:45:23+00:00 daily https://www.criticalmasssystems.co.uk/collections/vitalink-nutrients 2023-03-21T19:26:45+00:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/vitalink_max_grow.jpg?v=1605205937 Vitalink Nutrients https://www.criticalmasssystems.co.uk/collections/top-shelf-flowering-additives 2026-05-07T20:12:23+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/purpinator.jpg?v=1605260542 Top shelf flowering additives https://www.criticalmasssystems.co.uk/collections/winter-heating-deals-cut-price-heating-ideal-for-the-cooler-weather 2023-03-21T19:26:46+00:00 daily https://www.criticalmasssystems.co.uk/collections/all-lighting 2026-05-14T17:42:14+01:00 daily https://www.criticalmasssystems.co.uk/collections/environmental-control 2026-07-07T16:10:28+01:00 daily https://www.criticalmasssystems.co.uk/collections/grow-room-ventilation 2026-07-07T16:52:25+01:00 daily https://www.criticalmasssystems.co.uk/collections/soil-coco-and-hydroponic-growing-media 2026-06-17T12:04:44+01:00 daily https://www.criticalmasssystems.co.uk/collections/growing-media-1 2026-06-17T12:04:44+01:00 daily https://www.criticalmasssystems.co.uk/collections/propagation 2026-05-19T12:05:54+01:00 daily https://www.criticalmasssystems.co.uk/collections/nutrients-additives 2026-06-22T12:33:16+01:00 daily https://www.criticalmasssystems.co.uk/collections/grow-tents-tent-kits-sheeting 2026-05-07T20:14:44+01:00 daily https://www.criticalmasssystems.co.uk/collections/pest-disease-control 2026-05-14T16:18:06+01:00 daily https://www.criticalmasssystems.co.uk/collections/organic-growing 2026-06-16T12:41:23+01:00 daily https://www.criticalmasssystems.co.uk/collections/hydro-systems-drip-irrigation-pots-components 2026-06-16T12:41:23+01:00 daily https://www.criticalmasssystems.co.uk/collections/iws-flood-drain-systems 2026-05-07T20:15:13+01:00 daily https://www.criticalmasssystems.co.uk/collections/iws-basic-systems 2026-05-07T20:15:22+01:00 daily https://www.criticalmasssystems.co.uk/collections/iws-standard-systems 2026-05-07T20:15:13+01:00 daily https://www.criticalmasssystems.co.uk/collections/iws-pro-systems 2026-05-07T20:15:13+01:00 daily https://www.criticalmasssystems.co.uk/collections/hand-watering-kits 2026-05-07T20:15:21+01:00 daily https://www.criticalmasssystems.co.uk/collections/hand-watering-pro-kits 2026-05-07T20:15:25+01:00 daily https://www.criticalmasssystems.co.uk/collections/hand-watering-kits-standard 2026-05-07T20:15:34+01:00 daily https://www.criticalmasssystems.co.uk/collections/critical-drip-systems 2026-05-07T20:15:26+01:00 daily https://www.criticalmasssystems.co.uk/collections/critical-drip-systems-standard 2026-05-07T20:15:40+01:00 daily https://www.criticalmasssystems.co.uk/collections/critical-drip-systems-xl 2026-05-07T20:15:26+01:00 daily https://www.criticalmasssystems.co.uk/collections/critical-drip-systems-lite 2026-05-07T20:15:26+01:00 daily https://www.criticalmasssystems.co.uk/collections/ec-fan-silent-filtration-kits 2026-05-07T20:26:29+01:00 daily https://cdn.shopify.com/s/files/1/0397/1383/3127/collections/whispair_6_inch_ec.jpg?v=1625052862 Silent EC Fan and Carbon Filter Kits https://www.criticalmasssystems.co.uk/collections/mixed-flow-carbon-filter-kits 2026-05-07T20:26:49+01:00 daily https://www.criticalmasssystems.co.uk/collections/floraflex-big-mama-rockwool-drip-systems 2026-05-07T20:38:54+01:00 daily https://www.criticalmasssystems.co.uk/collections/ac-infinity-range 2026-07-08T09:23:12+01:00 daily