Water retaining crystals for pot plants (Keswick CA12)

Four sachets of "dry planet" "Water-less" crystals. The packet says "Dry Planet's Water-less crystals work by absorbing water and then slowly releasing it to your plants as they need it. This should reduce watering by up to 4 times and help the compost structure and reduce fertilizer/feed waste too." Use only a small amount in each pot, as these crystals swell a lot.